| 摘要 |
<p>Each terminal (30, 60) in a full-duplex communication system comprises a computer-controlled display screen such as a CRT (32), at least one input means such as a keyboard (34), a mouse (36) or a light pen (38) and bidirectional communication means (40, 70) through which the terminals are interconnected. Each communication means (40, 70) comprises a receiver for receiving display information received at the terminal from the remote terminal(s) (30, 60) and a transmitter (40, 46, 76, 78) for transmitting information to the remote terminal(s) where it is displayed. The invention enables multiple terminal users to simultaneously generate or modify a single common document in such a way that any changes to the document made by one user are instantaneously reflected at the terminals of all other users. To implement the present invention, each terminal (30, 60) comprises control means (50, 80) which periodically reads its input means and communications means and uses the information contained therein to control the content of a local copy of the common document stored in its memory.</p> |
