Virtual input device

• US 6,307,570 B1
• Filed: 12/19/1997
• Issued: 10/23/2001
• Est. Priority Date: 03/31/1997
• Status: Expired due to Term

• Current Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Original Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Inventors: Stergiades, Andrew L.
• Primary Examiner(s): Nguyen, Chanh
• Assistant Examiner(s): Alphonse, Fritz
• Application Number:
  US08/993,746
• Time in Patent Office: 1,404 Days
• Field of Search: 345/132, 345/333, 345/501, 345/327, 345/744, 345/746, 345/747, 345/156, 345/173, 345/357, 709/203, 709/204, 364/514
• US Class Current: 715/744
• CPC Class Codes: G06F 3/00 Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements

Abstract

A software object and method are disclosed which allow a client node to control the display and use of a software system-level input device application on a server. The server host and executes the input device application which is “raised” and “lowered” in response to change-of-state protocol packets. The system-level input application device may provide keyboard, keypad, or other input device functionality.

Claims

1. A method for controlling the display of an input device provided by an input device application executing on a server comprising:

(a) receiving on said server a raise-display protocol packet from a client node;

(b) changing said input device application executing on said server from a current state to a second state in response to said raise-display protocol packet;

(c) generating display data representative of an input device in response to said change in state; and

(d) transmitting said data to said client node for display by said client of said input device.

2. The method of claim 1 further comprising displaying said input device on said client node using said transmitted data.

3. The method of claim 2 wherein said displayed input device is a QWERTY keyboard.

4. The method of claim 2 wherein said step of displaying further comprises displaying said input device in a window without focus.

5. The method of claim 4 wherein said step of displaying further comprises displaying said window without focus on top of any other windows overlapping said window without focus concurrently displayed on said client.

6. The method of claim 1 further comprising receiving input data from said client node to said input device application on said server subsequent to step (d), said input data generated on said client node by using said input device provided by said input device application executing on said server.

7. The method of claim 6 wherein said input data represents user action associated with said input device displayed on said client node.

8. The method of claim 7 further comprising converting, by said input device application, said input data representing said user action into output data representing alphanumeric characters.

9. The method of claim 8 further comprising transmitting said output data to a second application.

10. The method of claim 1 further comprising:

receiving on said server a lower-display protocol packet from said client node;

changing said input device application from a current state to a another state in response to said lower-display protocol packet; and

transmitting data to said client node in response to said change in state to remove said input device displayed on said client.

11. The method of claim 10 further comprising removing said input device from a display on said client node in response to a lower-display protocol packet.

12. A method for providing input to a second application executing on a server comprising:

(a) receiving on said server a change-of-state protocol packet from a client node;

(b) changing an input device application executing on said server from a current state to a second state in response to said change-of-state protocol packet;

(c) receiving input on said server from said client node, said input representing user action associated with an input device displayed on said client node provided by said input device application;

(d) converting said received input by said input device application executing on said server to output data representing characters; and

(e) transmitting said output data as an input to said second application in response to the converted input.

13. The method of claim 12 wherein step (a) comprises receiving on said server a raise-display change-of-state protocol packet.

14. The method of claim 13 further comprising the step of:

(f) displaying an input device provided by said input device application on a display on said client node.

15. The method of claim 14 wherein step (f) further comprises displaying said input device in a window without focus.

16. The method of claim 12 wherein step (a) comprises receiving a lower-display change-of-state protocol packet.

17. The method of claim 16 further comprising the step of:

f) removing an input device provided by said input device application from a display on said client node in response to the lower-display change-of-state protocol packet.

18. The method of claim 12 further comprising transmitting, by said client node, said change-of-state protocol in response to a predefined user action.

19. The method of claim 18 wherein said predefined user action is moving a screen cursor into a predefined area of the screen.