Patent ID: 8310493

Claim:
A method comprising: transmitting display data to a participant digital processing system, the display data comprises a plurality of tiles, each tile represents a segment of the display data, each display data segment comprises pixel data that represents a portion of a plurality of pixels of a display screen of a moderator digital processing system and a time indicator indicating when the display data segment was created, wherein each of the tiles is periodically evaluated to determine whether any of the pixels within any of the tiles has changed and, when any of the pixels within any of the tiles changes, a new pixel data for that tile is used to create a new display data segment that replaces the display data segment for that tile on a server; receiving a request for a display data update from a participant digital processing system; accessing an update time indicator indicating the time of a previous transmission of display data; determining display data segments having a time indicator subsequent to the update time indicator; and transmitting the display data segments having a time indicator subsequent to the update time indicator to the participant digital processing system.