5. A remote control system using the method of claim 1.
To be continued  #0018
- Anfossi, et al. Screen remote control. U.S.Patent 6,141,022. October 31, 2000.

4. The method of claim 1 wherein the set of data comprises a portion of a bit-map image.
To be continued  #0017
- Anfossi, et al. Screen remote control. U.S.Patent 6,141,022. October 31, 2000.

3. The method of claim 1 wherein the set of data comprises a set of graphic commands.
To be continued  #0016
- Anfossi, et al. Screen remote control. U.S.Patent 6,141,022. October 31, 2000.

2. The method of claim 1 wherein the communication between the source and the destination data processing system is by means of a Local Area Network.
To be continued  #0015
- Anfossi, et al. Screen remote control. U.S.Patent 6,141,022. October 31, 2000.

responsive to the difference between the bit-map image and the image displayed on the source display unit exceeding a predetermined threshold, updating the bit-map image by copying the image displayed on the source display unit, and transmitting the bit-map image to the at least one destination data processing system.
To be continued  #0014
- Anfossi, et al. Screen remote control. U.S.Patent 6,141,022. October 31, 2000.

comparing, at predetermined frequency, the bit-map image with the image displayed on the source display unit;
To be continued  #0013
- Anfossi, et al. Screen remote control. U.S.Patent 6,141,022. October 31, 2000.

reproducing on a bit-map, allocated on the storage of the source data processing system, a shadow image according to said transmitted set of data;
To be continued  #0012
- Anfossi, et al. Screen remote control. U.S.Patent 6,141,022. October 31, 2000.

transmitting a set of data from said source data processing system to said at least one destination data processing system, the set of data being generated by those graphic commands issued by the source data processing system and belonging to a predetermined subset;
To be continued  #0011
- Anfossi, et al. Screen remote control. U.S.Patent 6,141,022. October 31, 2000.

1. A method for duplicating and refreshing, on the display of at least one destination data processing system, a graphic image displayed on the display of a source data processing system, the source and the destination data processing system being in communication, the method comprising the steps of:
To be continued  #0010
- Anfossi, et al. Screen remote control. U.S.Patent 6,141,022. October 31, 2000.

BACKGROUND OF THE INVENTION 7th paragraph

It is an object of the present invention to provide a technique which overcomes the above drawbacks.
- Anfossi, et al. Screen remote control. U.S.Patent 6,141,022. October 31, 2000.