Audiographic systems add to the audio channel different forms of low-bandwidth
graphics, such as text, diagrams, telewriting, or pictures. The level, quality, and
flexibility of the visual support vary widely from one system to another, depending on the
communication bandwidth and on the sophistication of the tutor's and learners' stations,
software, and peripherals. Some systems allow users to annotate a computer display screen
or electronic whiteboard with a keyboard or graphics pen and then to transmit the
annotations to the screens at the remote sites. More complex computer-based systems allow
collaboration, with participants at each site working together to develop a file or
document held on the system server.
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