Collaborative computing system using pseudo server process to allow input from different server processes individually and sequence number map for maintaining received data sequence

• US 5,392,400 A
• Filed: 07/02/1992
• Issued: 02/21/1995
• Est. Priority Date: 07/02/1992
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Hao, Ming C., Berkowitz, David B., Lieu, Hung C., Snow, Franklin D.
• Primary Examiner(s): Lee, Thomas C.
• Assistant Examiner(s): Meky, Moustafa M.
• Application Number:
  US07/909,505
• Time in Patent Office: 964 Days
• Field of Search: 395/200, 395/650, 395/700, 395/157, 395/148, 395/161, 395/153, 364/222.2, 364/284.4, 364/940.81
• US Class Current: 709/203
• CPC Class Codes: G06F 9/451 Execution arrangements for user interfaces
• CPC Class Codes: H04L 12/1813 for computer conferences, e.g. chat rooms instant messaging H04L51/04; protocols for multimedia communication H04L65/1101; arrangements for multi-party communication H04L65/403; telephonic conference arrangements H04M3/56; television conference systems H04N7/15
• CPC Class Codes: H04L 67/131 Protocols for games, networked simulations or virtual reality
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

A collaborative computing method and system are described. Output data from and input data for an application program are shared among all of the computers connected in a network using the X protocol. The output from the application program is intercepted and then replicated on each of the computers'"'"' displays. Input data for the application program can be read from any of the computers participating in the session. The identifying data associated with the output and input is modified so that each computer can operate as if it were the only computer controlling the application. The session is controlled by displaying on each computer'"'"'s display a control window which allows the users to invoke a shared application and to use tools such a pointer, marker, to manage a collaboration session. Each user has equal collaborative capabilities in a session. This collaborative method provides a symmetric sharing among all users. A scratch pad window may be created on each computer'"'"'s display. User data entered in a scratch pad window is normally replicated automatically on each of the other computers'"'"' displays, but a private mode is an alternative. Data entered by each computer in the scratch pad may be displayed with visual characteristics such as color which are unique to the computer on which the data was first entered.

Claims

1. A method for using a plurality of computers for collaborative computing, the computers being connected in a network, and each computer having a processor, a memory, a display, means for inputting data, a network server program, and means for transmitting and receiving data to and from the computers in the network, comprising the steps of:

transmitting data from a selected computer in the network to first and second server programs in first and second computers indicative of the start of a collaborative computing session;

loading a client application program into the memory of the selected computer in the network;

displaying on the first and second computers'"'"' displays a first set of output data from the client application program by transmitting the output data to the first and second server programs;

reading user input data from the second server program along with identifying data into the memory of the selected computer;

modifying the identifying data from the second server program in the memory of the selected computer to identify the data as coming from a pseudo-server program;

sending the user input data and the modified identifying data from the preceding step to the client application program as application input data;

displaying on the first and second computers'"'"' displays a second set of output data from the client application program by transmitting the second set of output data to the first and second server programs;

reading user input data from the first server program along with identifying data into the memory of the selected computer;

modifying the identifying data from the first server program that is in the memory of the selected computer to identify the data as coming from the pseudo-server program;

sending the user input data and the modified identifying data from the preceding step to the client application program as application input data; and

displaying on the first and second computers'"'"' displays a third set of output data from the client application program by transmitting the third set of output data to the first and second server programs;

storing mapping data in the memory of the selected computer in the network, the mapping data indicative of the sequence of user data received from each of the first and second server programs;

receiving output data from the client application program including a sequence number field, the output data received at the selected computer in the network;

modifying the sequence number field to correspond to a sequence number one higher than the highest sequence number in the mapping data for the first server program;

transmitting the output data containing the modified sequence number to the first server program;

modifying the sequence number field to correspond to a sequence number one higher than the highest sequence number in the mapping data for the second server program; and

transmitting the output data containing the modified sequence number to the second server program;

whereby, first and second computers using server programs provide input to a client application program and display the output from the client application program in a collaboration session.

2. The method of claim 1, wherein the step of displaying the output data from the application program on the first and second computers'"'"' displays further comprises the steps of:

receiving output data from the client application program including data identifying the pseudo-server program;

modifying the output data identifying the pseudo-server program to identify the second server program; and

transmitting the output data modified in the preceding step to the second server program.

3. The method of claim 1, further comprising the steps of:

transmitting prompting data from the selected computer to a third server program in a third computer indicative of an invitation to join a collaborative computing session;

reading data from the third server program responding to the prompting data; and

adding the third computer to the collaborative computing session responsive to an affirmative reply from the third server program.

4. The method of claim 1, wherein first and second computers have multiple windowing capability, further comprising the steps of:

displaying on the first and second computers'"'"' displays a control window;

reading user data entered in the control window on the first or second computer; and

executing commands in the user data entered in the control window without sending them to the client application program;

thereby, allowing users of the first and second computers to control a collaborative computing session.

5. The method of claim 4, wherein the first and second computers also have users, and further comprising the steps of:

reading user request data entered in a control window indicative of a request by a selected user to cause data entered on the display of the selected user to be replicated on the displays of other computers in the collaborative computing session, the ability to cause the replication to the displays in the collaborative computing session referred to as controlling a floor;

testing a state of a floor control variable in the memory of the selected computer that is indicative of which user has control of the floor;

storing the user request data at the bottom of a first-in-first-out (FIFO) queue in the memory of the selected computer if a user other than the selected user has control of the floor, otherwise giving the selected user the control of the floor and setting the floor control variable in the memory of the selected computer to indicate the selected user;

reading into the memory of the selected computer data from a user having control of the floor data indicative of releasing the floor; and

processing the queue in the memory of the selected computer by removing the user request data, identifying a designated user, on top of the queue, setting the floor control variable in the memory of the selected computer to indicate the designated user and giving the control of the floor to the designated user.

6. The method of claim 1, wherein first and second computers have multiple windowing capability, further comprising the steps of:

displaying on one of the first [or]and second computers'"'"' displays a scratch pad window;

modifying the contents of the scratch pad window responsive to user input data;

reading a command to transmit the scratch pad window;

replicating the scratch pad window on the displays of the other computer (first or second) by transmitting data to the other computer;

thereby, allowing a user to enter data into the scratch pad window in a private mode and transmit the contents to the other users when it is completed.

7. The method of claim 6 wherein the replicating step further comprises the step of displaying user data entered in the scratch pad window with visual characteristics which are unique to the computer on which the data was first entered.

8. The method of claim 7, wherein the visual characteristics include color, type style, size, or pen width.

9. A method for using a plurality of computers for collaborative computing, the computers being connected in a network, and each computer having a processor, a memory, a display, means for inputting data, means for transmitting and receiving data to and from the computers in the network and a network server program, comprising the steps of:

transmitting data from a first server program to a second server program in first and second computers indicative of a collaborative computing session starting;

loading a client application program into the memory of the first computer;

displaying on the first and second computers'"'"' displays a first set of output data from the client application program by transmitting the output data to the first and second server programs;

reading user input data from the second server program along with identifying data into the memory of the first computer;

modifying the identifying data from the second server program in the memory of the first computer to identify the data as coming from a pseudo-server program;

sending the user input data from the second server program and the modified identifying data from the preceding step to the client application program as application input data;

displaying on the first and second computers'"'"' displays a second set of output data from the client application program by transmitting the second set of output data to the first and second server programs;

reading user input data from the first server program along with identifying data into the memory of the first computer;

modifying the identifying data from the first server program that is in the memory of the first computer to identify the data as coming from the pseudo-server program;

sending the user input data from the first server program and the modified identifying data from the preceding step to the client application program as application input data; and

displaying on the first and second computers'"'"' displays a third set of output data from the client application program by transmitting the third set of output data to the first and second server programs storing mapping data in the memory of the first computer, the mapping data indicative of the sequence of user data received from each of the first and second server programs;

receiving output data from the client application program including a sequence number field, the output data received in the memory of the first computer;

modifying the sequence number field in the memory of he first computer to correspond to a sequence number one higher than the highest sequence number in the mapping data for the first server program;

transmitting the output data containing the modified sequence number to the first server program;

modifying the sequence number field in the memory of the first computer to correspond to a sequence number one higher than the highest sequence number in the mapping data for the second server program; and

transmitting the output data containing the modified sequence number to the second server program;

whereby, first and second computers using server[s]programs provide input to a client application program and display the output from the client application program in a collaboration session.

10. The method of claim 9, wherein the step of displaying the output data from the client application program on the first and second computers'"'"' displays further comprises the steps of:

receiving output data from the client application program including data identifying the pseudo-server program;

modifying the output data identifying the pseudo-server program to identify the second server program; and

transmitting the output data modified in the preceding step to the second server program.

11. The method of claim 9, further comprising the steps of:

transmitting prompting data from the first computer to a third server program in a third computer indicative of an invitation to join a collaborative computing session;

reading data from the third server program responding to the prompting data; and

adding the third computer to the collaborative computing session responsive to an affirmative reply from the third server program.

12. The method of claim 9, wherein first and second computers have multiple windowing capability, further comprising the steps of

displaying a control window on the first and second computers'"'"' displays;

reading user data entered in the control window on the first or second computer; and

executing commands in the user data entered in the control window without sending them to the client application program;

thereby, allowing users of the first and second computers to control the collaborative computing session.

13. The method of claim 12, wherein the first and second computers have users, further comprising the steps of:

reading user request data entered in a control window indicative of a request by a selected user at a selected computer to cause data entered on the display of the selected user to be replicated on the displays of other computers in the collaborative computing session, the ability to cause the replication to the displays in the collaborative computing session referred to as controlling a floor;

testing a state of a floor control variable in the memory of the first computer that is indicative of which user has control of the floor;

storing the user request data at the bottom of a first-in-first-out (FIFO) queue in the memory of the first computer if a user other than the selected user has control of the floor, otherwise giving the selected user the control of the floor and setting the floor control variable in the memory of the first computer to indicate the selected user;

reading into the memory of the first computer data from a user having control of the floor data indicative of releasing the floor; and

processing the queue in the memory of the first computer by removing the user request data, identifying a designated user, on top of the queue, setting the floor control variable in the memory of the first computer to indicate the designated user and giving the control of the floor to the designated user.

14. The method of claim 9, wherein first and second computers have multiple windowing capability, further comprising the steps of:

displaying on one of the first [or]and second computers'"'"' displays a scratch pad window;

modifying the contents of the scratch paid window responsive to user input data;

reading a command to transmit the scratch pad window;

replicating the scratch pad window on the displays of the other computer (first or second) by transmitting data to the other computer;

thereby, allowing a user to enter data into the scratch pad in a private mode and transmit the contents to the other users when it is completed.

15. The method of claim 14, wherein the replicating step further comprises the step of displaying user data entered in the scratch pad window with visual characteristics which are unique to the computer on which the data was first entered.