A low cost room-based videoconferencing system for videoconferencing between many stations. In the invention, each station includes a computer (12) running a windowing operating system and PROSHARE. It also includes a communication link (30) connecting the computer (12) and one or more of the videoconferencing stations. In addition there are video (16) and audio (14) input devices connected to the computer (12). A DCI-enabled video card (18) is connected to the computer. A NTSC converter (24) is connected to the output of the DCI-enabled graphics card (20) and one or more NTSC television monitors (26, 28) are connected to the NTSC converter (24). PROSHARE manages the videoconferencing sessions and provides a small video image. The DCI-enabled video card (18) stretches the small PROSHARE image to a full screen image which is then converted by the NTSC converter (24) and displayed on an inexpensive NTSC television monitor (28).
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