Managing user definable co-user lists

• US 20130117690A1
• Filed: 12/19/2012
• Published: 05/09/2013
• Est. Priority Date: 02/24/1997
• Status: Active Grant

• Current Assignee: Meta Platforms, Inc. (f/k/a Facebook, Inc.)
• Original Assignee: Meta Platforms, Inc. (f/k/a Facebook, Inc.)
• Inventors: Appelman, Barry
• Granted Patent: US 8,667,398 B2
• Time in Patent Office: Days
• US Class Current: 715/752
• CPC Class Codes: G06F 16/903 Querying for retrieval from the web G06F16/953
• CPC Class Codes: G06F 3/01 Input arrangements or combined input and output arrangements for interaction between user and computer G06F3/16 takes precedence
• CPC Class Codes: G06F 3/0481 based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance
• CPC Class Codes: G06F 3/0484 for the control of specific functions or operations, e.g. selecting or manipulating an object, an image or a displayed text element, setting a parameter value or selecting a range
• CPC Class Codes: G06F 3/04842 Selection of displayed objects or displayed text elements G06F3/0482 takes precedence
• CPC Class Codes: G06Q 10/10 Office automation; Time management
• CPC Class Codes: H04L 51/04 Real-time or near real-time messaging, e.g. instant messaging [IM]
• CPC Class Codes: H04L 51/043 using or handling presence information
• CPC Class Codes: H04L 51/10 Multimedia information
• CPC Class Codes: H04L 51/216 Handling conversation history, e.g. grouping of messages in sessions or threads
• CPC Class Codes: H04L 51/48 Message addressing, e.g. address format or anonymous messages, aliases
• CPC Class Codes: H04L 63/10 for controlling access to devices or network resources
• CPC Class Codes: H04L 67/54 Presence management, e.g. monitoring or registration for receipt of user log-on information, or the connection status of the users

Abstract

A real time notification system that tracks, for each user, the logon status of selected co-users of an on-line or network system and displays that information in real time to the tracking user in a unique graphical interface. The invention provides user definable on-line co-user lists, or “buddy lists”, that track specific co-users in real-time automatically. A user can create many separate buddy lists of co-users, either with intersecting or disjoint lists of users, and label these buddy lists according to the user'"'"'s preference. The user can update a buddy list or create new buddy lists whenever necessary. When a user logs on to a system, the user'"'"'s set of buddy lists is presented to the buddy list system. The buddy list system attempts to match co-users currently logged into the system with the entries on the user'"'"'s buddy list. Any matches are displayed to the user. As co-users logon and loge, a user'"'"'s buddy list is updated to reflect these changes. An indication can also be added to show that a co-user just logged on or just left the system.

Claims

1. (canceled)

2. (canceled)

3. (canceled)

4. (canceled)

5. (canceled)

6. (canceled)

7. (canceled)

8. (canceled)

9. (canceled)

10. (canceled)

11. (canceled)

12. (canceled)

13. (canceled)

14. (canceled)

15. A graphical user interface produced on a computing device having a display associated therewith, the graphical user interface comprising:

a name field displayed on the display, the name field including an area for entering a name of a co-user of a communications system; and

a first selectable element displayed on the display;

wherein;

upon user selection of the first selectable element a co-user entered into the name field is added to a user-defined list of co-users associated with a user of the communications system;

the user-defined list of co-users is maintained in a non-transitory storage medium; and

the user is able to send electronic messages to users on the user-defined list of co-users.

16. The graphical user interface as recited in claim 15, wherein the first selectable element comprises an add button.

17. The graphical user interface as recited in claim 15, further comprising a listing displayed on the display, the listing including one or more co-users on the user-defined list of co-users.

18. The graphical user interface as recited in claim 17, further comprising:

a second selectable element displayed on the display;

wherein upon user selection of the second selectable element, a co-user selected in the additional window is removed from the user-defined list of co-users.

19. The graphical user interface as recited in claim 18, wherein the second selectable element comprises a remove button.

20. The graphical user interface as recited in claim Error! Reference source not found., wherein the user is able to perceive a status of co-users on the user-defined list of co-users when the user logs into the communications system.

21. The graphical user interface as recited in claim Error! Reference source not found., further comprising a list-name field displayed on the display, the list-name field for entering a name of the user-defined list of co-users.

22. A method comprising:

displaying a name field on a display of a computing device, the name field including an area for entering a name of a co-user of a communications system; and

displaying a first selectable element on the display;

wherein;

upon user selection of the first selectable element a co-user entered into the name field is added to a user-defined list of co-users associated with a user of the communications system;

the user-defined list of co-users is maintained in a non-transitory storage medium; and

the user is able to send electronic messages to users on the user-defined list of co-users.

23. The method as recited in claim 22, wherein the first selectable element comprises an add button.

24. The method as recited in claim 22, further comprising displaying a listing on the display, the listing including one or more co-users on the user-defined list of co-users.

25. The method as recited in claim 22, further comprising:

displaying a second selectable element on the display;

wherein upon user selection of the second selectable element, a co-user selected in the additional window is removed from the user-defined list of co-users.

26. The method as recited in claim 25, wherein the second selectable element comprises a remove button.

27. The method as recited in claim 22, wherein the user is able to perceive a status of co-users on the user-defined list of co-users when the user logs into the communications system.

28. The method as recited in claim 22, further comprising displaying a list-name field on the display, the list-name field including an area for entering a name of the user-defined list of co-users.

29. A non-transitory computer-readable storage medium including a set of instructions that, when executed, by a computing device having a display, cause the computing device to:

display a name field for entering a name of a co-user of a communications system; and

display a first selectable element on the display;

wherein;

upon user selection of the first selectable element a co-user entered into the name field is added to a user-defined list of co-users associated with a user of the communications system;

the user-defined list of co-users is maintained in a non-transitory storage medium; and

the user is able to send electronic messages to users on the user-defined list of co-users.

30. The computer-readable storage medium as recited in claim 29, wherein the first selectable element comprises an add button.

31. The computer-readable storage medium as recited in claim 29, further comprising instructions that, when executed, cause the computing device to display a listing, the listing including one or more co-users on the user-defined list of co-users.

32. The computer-readable storage medium as recited in claim 29, further comprising instructions that, when executed, cause the computing device to:

display a second selectable element on the display;

wherein upon user selection of the second selectable element, a co-user selected in the additional window is removed from the user-defined list of co-users.

33. The computer-readable storage medium as recited in claim 32, wherein the second selectable element comprises a remove button.

34. The computer-readable storage medium as recited in claim 29, wherein the user is able to perceive a status of co-users on the user-defined list of co-users when the user logs into the communications system.

35. The computer-readable storage medium as recited in claim 29, further comprising instructions that, when executed, cause the computing device to display on the display a list-name field on the display for entering a name of the user-defined list of co-users.

36. A graphical user interface produced on a computing device having a display associated therewith, the graphical user interface comprising:

at least a first interface area including one or more of;

a keyword field for entering one or more search terms associated with a co-user of a communications system;

a name field for entering a name associated with a co-user of the communications system;

or

a location field for entering a location associated with a co-user of the communications system; and

a first selectable element;

wherein, upon user selection of the first selectable element, a directory of co-users is searched for any co-user profiles including any search terms included in the keyword field, the name field, or the location field.

37. The graphical user interface as recited in claim 36, wherein the first selectable element comprises a search button.

38. The graphical user interface as recited in claim 36, wherein the at least a first interface area comprising a window.

39. The graphical user interface as recited in claim 36, further comprising:

a second selectable element displayed on the display;

wherein;

upon user selection of the second selectable element, a co-user found searching the directory of co-users is added to a user-defined list of co-users associated with a user of the communications system; and

the user-defined list of co-users allows the user to perceive the status of co-users on the user-defined list of co-users.

40. The graphical user interface as recited in claim 39, wherein the second selectable element comprises an add button.

41. The graphical user interface as recited in claim 36, wherein the at least a first interface area comprises a name field and a location field.

42. The graphical user interface as recited in claim 41, wherein the at least a first interface area comprises a keyword field, a name field, and a location field.

43. The graphical user interface as recited in claim 36, further comprising displaying a results list including a name associated with a co-user having an associated co-user profile including a term included in the keyword field, the name field, or the location field.

44. The graphical user interface as recited in claim 43, further comprising:

a third selectable element displayed on the display;

wherein, upon user selection of the third selectable element, only co-users currently logged into the communications system are included in the results list.

45. The graphical user interface as recited in claim 36, further comprising:

a fourth selectable element displayed on the display;

wherein, upon user selection of the fourth selectable element, at least a second interface area is displayed on the display that allows a user of the communications system to create or modify a profile associated with the user.

46. A method comprising:

displaying at least a first interface area on a display of a computing device, the first interface area including one or more of;

a keyword field for entering one or more search terms associated with a co-user of a communications system;

a name field for entering a name associated with a co-user of the communications system;

or

a location field for entering a location associated with a co-user of the communications system; and

a first selectable element;

wherein, upon user selection of the first selectable element, a directory of co-users is searched for any co-user profiles including any search terms included in the keyword field, the name field, or the location field.

47. The method as recited in claim 46, wherein the first selectable element comprises a search button.

48. The method as recited in claim 46, wherein the at least a first interface area comprising a window.

49. The method as recited in claim 46, further comprising:

displaying a second selectable element on the display;

wherein;

upon user selection of the second selectable element, a co-user found searching the directory of co-users is added to a user-defined list of co-users associated with a user of the communications system; and

the user-defined list of co-users allows the user to perceive the status of co-users on the user-defined list of co-users.

50. The method as recited in claim 49, wherein the second selectable element comprises an add button.

51. The method as recited in claim 46, wherein the at least a first interface area comprises a name field and a location field.

52. The method as recited in claim 51, wherein the at least a first interface area comprises a keyword field, a name field, and a location field.

53. The method as recited in claim 46, further comprising displaying a results list including a name associated with a co-users having an associated co-user profile including a term included in the keyword field, the name field, or the location field.

54. The method as recited in claim 53, further comprising:

displaying a third selectable element on the display;

wherein, upon user selection of the third selectable element, only co-users currently logged into the communications system are included in the results list.

55. The method as recited in claim 47, further comprising:

displaying a fourth selectable element on the display;

wherein, upon user selection of the fourth selectable element, at least a second interface area is displayed on the display that allows a user of the communications system to create or modify a profile associated with the user.

56. A non-transitory computer-readable storage medium including a set of instructions that, when executed, by a computing device having a display, cause the computing device to:

display at least a first interface area on the display, the first interface area including one or more of;

a keyword field for entering one or more search terms associated with a co-user of a communications system;

a name field for entering a name associated with a co-user of the communications system;

or

a location field for entering a location associated with a co-user of the communications system; and

a first selectable element;

wherein, upon user selection of the first selectable element, a directory of co-users is searched for any co-user profiles including any search terms included in the keyword field, the name field, or the location field.

57. The computer-readable storage medium as recited in claim 56, wherein the first selectable element comprises a search button.

58. The computer-readable storage medium as recited in claim 56, wherein the at least a first interface area comprising a window.

59. The computer-readable storage medium as recited in claim 56, further comprising instructions that, when executed, cause the computing device to:

display a second selectable element on the display;

wherein;

upon user selection of the second selectable element, a co-user found searching the directory of co-users is added to a user-defined list of co-users associated with a user of the communications system; and

the user-defined list of co-users allows the user to perceive the status of co-users on the user-defined list of co-users.

60. The computer-readable storage medium as recited in claim 59, wherein the second selectable element comprises an add button.

61. The computer-readable storage medium as recited in claim 56, wherein the at least a first interface area comprises a name field and a location field.

62. The computer-readable storage medium as recited in claim 61, wherein the at least a first interface area comprises a keyword field, a name field, and a location field.

63. The computer-readable storage medium as recited in claim 56, further comprising instructions that, when executed, cause the computing device to display a results list including a name associated with a co-users having an associated co-user profile including a term included in the keyword field, the name field, or the location field.

64. The computer-readable storage medium as recited in claim 63, further comprising instructions that, when executed, cause the computing device to:

display a third selectable element on the display;

wherein, upon user selection of the third selectable element, only co-users currently logged into the communications system are included in the results list.

65. The computer-readable storage medium as recited in claim 56, further comprising instructions that, when executed, cause the computing device to:

display a fourth selectable element on the display;

wherein, upon user selection of the fourth selectable element, at least a second interface area is displayed on the display that allows a user of the communications system to create or modify a profile associated with the user.

66. A graphical user interface produced on a computing device having a display associated therewith, the graphical user interface comprising:

a first interface area displayed on the display, the first interface area including;

a name of a user-defined list of co-users, the user-defined list of co-users being associated with a user of a communications system;

a number displayed in connection with the name of the user-defined list of co-users, the number indicating the number of co-users included in the user-defined list of co-users; and

a first selectable option for adding co-users to the user-defined list of co-users;

wherein upon user selection of the first selectable option, a second interface area is displayed on the display, the second interface area including one or more fields for entering one or more search criteria for finding a co-user of the communications system to add to the user-defined list of co-users.

67. The graphical user interface as recited in claim 66, wherein the one or more fields comprise a name field for entering a name associated with a co-user of the communications system.

68. The graphical user interface as recited in claim 67, wherein the one or more fields further comprise a location field for entering a location associated with a co-user of the communications system.

69. The graphical user interface as recited in claim 66, wherein the first and second interface areas each comprise windows.

70. The graphical user interface as recited in claim 66, wherein the one or more fields comprise a keyword field for entering one or more search terms associated with a co-user of the communications system.

71. The graphical user interface as recited in claim 66, further comprising:

a selectable search option displayed on the display in connection with the second window;

wherein, upon user selection of the selectable search option, a directory of co-users is searched for any co-user profiles including any search terms included in the one or more fields.

72. The graphical user interface as recited in claim 71, wherein the selectable search option comprises a search button.

73. The graphical user interface as recited in claim 71, further comprising:

a second selectable option displayed on the display;

wherein upon user selection of the second selectable option, a co-user found searching the directory of co-users is added to the user-defined list of co-users.

74. The graphical user interface as recited in claim 66, wherein the user-defined list of co-users allows the user to perceive a status of co-users on the user-defined list of co-users.

75. The graphical user interface as recited in claim 66, further comprising:

a third selectable option for creating an additional user-defined list of co-users;

wherein upon user selection of the third selectable option, a third interface area is displayed on the display, the third interface area including one or more fields for entering a name for the additional user-defined list of co-users.

76. The graphical user interface as recited in claim 75, further comprising:

a selectable add option displayed in connection with the third interface area;

wherein upon user selection of the selectable add option, a co-user entered into a co-user name field is added to the additional user-defined list of co-users.

77. The graphical user interface as recited in claim 76, wherein the selectable add option comprises an add button.

78. The graphical user interface as recited in claim 76, wherein the third interface area further comprises a listing displayed on the display, the listing including one or more co-users on the additional user-defined list of co-users.

79. The graphical user interface as recited in claim 77, wherein the third interface area further comprises:

a selectable profile option; and

wherein, upon user selection of the selectable profile option, a profile user interface is displayed on the display that allows a user of the communications system to create or modify a profile associated with the user.

80. The graphical user interface as recited in claim 66, wherein the first interface area further comprises:

a fourth selectable option for managing one or more preferences;

wherein upon user selection of the fourth selectable option, a fourth interface area is displayed on the display, the fourth interface area including one or more selectable preference options.

81. The graphical user interface as recited in claim 80, wherein:

the one or more selectable preference options comprise a first selectable preference option;

upon user selection of the first selectable preference option, each time the user logs into the communications system using the computing device a co-user list interface area is automatically displayed on the display; and

the co-user list interface area including one or more usernames of co-users on the user-defined list of co-users.

82. The graphical user interface as recited in claim 81, wherein the co-user list interface area further includes an indication next the at least one username of a co-user on the user-defined list of co-users, the indication signaling whether the co-user associated with the at least one username is currently logged into the communications system.

83. The graphical user interface as recited in claim 80, wherein:

the one or more selectable preference options comprise a second selectable preference option; and

upon user selection of the second selectable preference option, each time a co-user on the user-defined list of co-users logs into the communications system a sound is played.

84. The graphical user interface as recited in claim 83, wherein:

the fourth interface area further comprises a selectable sound library option; and

upon user selection of the selectable sound library option, a user is allowed to select a sound to play when a co-user on the user-defined list of co-users logs into the communications system.

85. The graphical user interface as recited in claim 80, wherein:

the one or more selectable preference options comprise a third selectable preference option; and

upon user selection of the third selectable preference option, each time a co-user on the user-defined list of co-users logs out of the communications system a sound is played.

86. A method comprising:

displaying a first interface area on a display of a computing device, the first interface area including;

a name of a user-defined list of co-users, the user-defined list of co-users being associated with a user of a communications system;

a number displayed in connection with the name of the user-defined list of co-users, the number indicating the number of co-users included in the user-defined list of co-users; and

a first selectable option for adding co-users to the user-defined list of co-users; and

displaying a second interface area on the display upon user selection of the first selectable option, the second interface area including one or more fields for entering one or more search criteria for finding a co-user of the communications system to add to the user-defined list of co-users.

87. The method as recited in claim 86, wherein the one or more fields comprise a name field for entering a name associated with a co-user of the communications system.

88. The method as recited in claim 87, wherein the one or more fields further comprise a location field for entering a location associated with a co-user of the communications system.

89. The method as recited in claim 86, wherein the one or more fields comprise a keyword field for entering one or more search terms associated with a co-user of the communications system.

90. The method as recited in claim 86, wherein the first and second interface areas each comprise windows.

91. The method as recited in claim 86, further comprising:

displaying a selectable search option;

wherein, upon user selection of the selectable search option, a directory of co-users is searched for any co-user profiles including any search terms included in the one or more fields.

92. The method as recited in claim 91, wherein the selectable search option comprises a search button.

93. The method as recited in claim 90, further comprising:

displaying a second selectable option;

wherein upon user selection of the second selectable option, a co-user found searching the directory of co-users is added to the user-defined list of co-users.

94. The method as recited in claim 86, wherein the user-defined list of co-users allows the user to perceive a status of co-users on the user-defined list of co-users.

95. The method as recited in claim 86, further comprising:

displaying a third selectable option for creating an additional user-defined list of co-users; and

displaying a third interface area upon user selection of the third selectable option, the third interface area including one or more fields for entering a name for the additional user-defined list of co-users.

96. The method as recited in claim 95, further comprising:

displaying a selectable add option;

wherein upon user selection of the selectable add option, a co-user entered into a co-user name field is added to the additional user-defined list of co-users.

97. The method as recited in claim 96, wherein the selectable add option comprises an add button.

98. The method as recited in claim 96, further comprising displaying a listing in connection with the third interface area, the listing including one or more co-users on the additional user-defined list of co-users.

99. The method as recited in claim 97, further comprising:

displaying a selectable profile option in connection with the third interface area; and

displaying a profile user interface upon user selection of the selectable profile option, the profile user interface allowing a user of the communications system to create or modify a profile associated with the user.

100. The method as recited in claim 86, further comprising:

displaying a fourth selectable option for managing one or more preferences;

displaying a fourth interface area upon user selection of the fourth selectable option, the fourth interface area including one or more selectable preference options.

101. The method as recited in claim 100, further comprising:

displaying a first selectable preference option; and

upon user selection of the first selectable preference option, displaying a co-user list interface automatically each time the user logs into the communications system;

wherein the co-user list interface includes one or more usernames of co-users on the user-defined list of co-users.

102. The method as recited in claim 101, further comprising displaying an indication next the at least one username displayed in the co-user list interface, the indication signaling whether the co-user associated with the at least one username is currently logged into the communications system.

103. The method as recited in claim 100, further comprising:

displaying a second selectable preference option; and

upon user selection of the second selectable preference option, playing a sound each time a co-user on the user-defined list of co-users logs into the communications system.

104. The method as recited in claim 103, further comprising:

displaying a sound library button in connection with the fourth interface area; and

upon user selection of the sound library button, presenting a user a selection of sounds to play when a co-user on the user-defined list of co-users logs into the communications system.

105. The method as recited in claim 100, further comprising:

displaying a third selectable preference option; and

upon user selection of the third selectable preference option, playing a sound each time a co-user on the user-defined list of co-users logs out of the communications system.

106. A non-transitory computer-readable storage medium including a set of instructions that, when executed, by a computing device having a display, cause the computing device to:

display a first interface area on the display, the first interface area including;

a name of a user-defined list of co-users, the user-defined list of co-users being associated with a user of a communications system;

a number displayed in connection with the name of the user-defined list of co-users, the number indicating the number of co-users included in the user-defined list of co-users; and

<

a first selectable option for adding co-users to the user-defined list of co-users; and

display a second interface area on the display upon user selection of the first selectable option, the second interface area including one or more fields for entering one or more search criteria for finding a co-user of the communications system to add to the user-defined list of co-users.

107. The computer-readable storage medium as recited in claim 106, wherein the one or more fields comprise a name field for entering a name associated with a co-user of the communications system.

108. The computer-readable storage medium as recited in claim 107, wherein the one or more fields further comprise a location field for entering a location associated with a co-user of the communications system.

109. The computer-readable storage medium as recited in claim 106, wherein the one or more fields comprise a keyword field for entering one or more search terms associated with a co-user of the communications system.

110. The graphical user interface as recited in claim 106, wherein the first and second interface areas each comprise windows.

111. The computer-readable storage medium as recited in claim 106, further comprising instructions that, when executed, cause the computing device to:

display a selectable search option on the display;

wherein, upon user selection of the selectable search option, a directory of co-users is searched for any co-user profiles including any search terms included in the one or more fields.

112. The computer-readable storage medium as recited in claim 111, wherein the selectable search option comprises a search button.

113. The computer-readable storage medium as recited in claim 110, further comprising instructions that, when executed, cause the computing device to:

display a second selectable option on the display;

wherein upon user selection of the second selectable option, a co-user found searching the directory of co-users is added to the user-defined list of co-users.

114. The computer-readable storage medium as recited in claim 106, wherein the user-defined list of co-users allows the user to perceive a status of co-users on the user-defined list of co-users.

115. The computer-readable storage medium as recited in claim 106, further comprising instructions that, when executed, cause the computing device to:

display, on the display, a third selectable option for creating an additional user-defined list of co-users; and

display on the display, upon user selection of the third selectable option, a third interface area including one or more fields for entering a name for the additional user-defined list of co-users.

116. The computer-readable storage medium as recited in claim 115, further comprising instructions that, when executed, cause the computing device to:

display a selectable add option on the display;

wherein upon user selection of the selectable add option, a co-user entered into a co-user name field is added to the additional user-defined list of co-users.

117. The computer-readable storage medium as recited in claim 116, wherein the selectable add option comprises an add button.

118. The computer-readable storage medium as recited in claim 116, further comprising instructions that, when executed, cause the computing device to display a listing on the display device in connection with the third interface area, the listing including one or more co-users on the additional user-defined list of co-users.

119. The computer-readable storage medium as recited in claim 117, further comprising instructions that, when executed, cause the computing device to:

display a selectable profile option on the display in connection with the third interface area; and

display a profile user interface on the display upon user selection of the selectable profile option, the profile user interface allowing a user of the communications system to create or modify a profile associated with the user.

120. The computer-readable storage medium as recited in claim 106, further comprising instructions that, when executed, cause the computing device to:

display a fourth selectable option for managing one or more preferences on the display in connection with the first interface area;

display a fourth interface area on the display upon user selection of the fourth selectable option, the fourth interface area including one or more selectable preference options.

121. The computer-readable storage medium as recited in claim 120, further comprising instructions that, when executed, cause the computing device to:

display a first selectable preference option on the display; and

upon user selection of the first selectable preference option, display a co-user list interface automatically on the display each time the user logs into the communications system using the computing;

wherein the co-user list interface includes one or more usernames of co-users on the user-defined list of co-users.

122. The computer-readable storage medium as recited in claim 121, further comprising instructions that, when executed, cause the computing device to display an indication next the at least one username displayed in the co-user list interface, the indication signaling whether the co-user associated with the at least one username is currently logged into the communications system.

123. The computer-readable storage medium as recited in claim 120, further comprising instructions that, when executed, cause the computing device to:

display a second selectable preference option on the display; and

upon user selection of the second selectable preference option, play a sound each time a co-user on the user-defined list of co-users logs into the communications system.

124. The computer-readable storage medium as recited in claim 123, further comprising instructions that, when executed, cause the computing device to:

display a sound library button on the display in connection with the fourth interface area; and

upon user selection of the sound library button, allow a user to select a sound to play when a co-user on the user-defined list of co-users logs into the communications system.

125. The computer-readable storage medium as recited in claim 120, further comprising instructions that, when executed, cause the computing device to:

display a third selectable preference option on the display; and

upon user selection of the third selectable preference option, play a sound each time a co-user on the user-defined list of co-users logs out of the communications system.