Audio & video chat/conference/webcam

Combination of audio conferencing with computer text and graphics, allowing both voice and data to be transmitted to remote sites. Provides two-way data exchange (limited to images & text only) and a synchronous interactive environment between the instructor and students at multiple sites. 

Can be expensive (examples: Breeze, Elluminate, Netmeeting, Polycom). 

Free Alternatives: Dimdim, and other screencasting tools.

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