Depending on the technology being used, participants may speak and listen to audio over standard telephone lines or via computer microphones and speakers. Some products allow for use of a webcam to display participants, while others may require their own proprietary encoding or externally provided encoding of a video feed (for example, from a professional video camera connected via an IEEE 1394 interface) that is displayed in the session.
Real-time text chat facilities such as IRC appeared in the late 1980s. Web-based chat and instant messaging software appeared in the mid-1990s. The PLATO computer learning system allowed students to collaborate on networked computers to accomplish learning tasks as early as the 1960s, but the early networking was not accomplished via the World Wide Web and PLATO's collaborative goals were not consistent with the presenter-audience dynamic typical of web conferencing systems. PLATO II, in 1961, featured two users at once.
David Risley is the founder of the Blog Marketing Academy, a 20-year veteran blogger and online entrepreneur. His focus? Building a reliable, recurring business around his "lifestyle" and the lives of his students. He has this weird obsession with traveling in his motorhome around the country with his wife and 2 kids. David also likes to talk about himself in the third person. In bios like this one. Read his full story.