Disclosed is a system and method for electronic-based communication between a plurality of remote users. The system includes a plurality of remote workstations, interconnected via a communication network, so that users may simultaneously view a target file. Further, the system may permit one or more...http://www.google.de/patents/US7363589?utm_source=gb-gplus-sharePatent US7363589 - System and method for generating invisible notes on a presenter's screen
