| 摘要 |
An interactive communication system comprises a central controller (1); and at least one remote unit (9) connected in use to a display device (12), the central controller (1) generating signals in accordance with a service function, access to all or part of which is restricted. The signals are supplied to the remote unit(s) (9) for display on the display device (12). The or each remote unit (9) includes a processor (14), responsive to signals from the central controller (1), and selectively connectable to the central controller to transmit information back to the central controller. The or each remote unit (9) further comprises an input device (16) and a control memory (17) connected to the processor (14), the input device (16) allowing a user to enter information, and the control memory (17) storing access control data. The processor (14) is responsive to the access control data to allow a user to gain access to the restricted part of the service function, and periodically supplies data to the central controller (1) related to said access. The central controller (1) can generate signals which are supplied to the remote unit(s) (9) to modify the access control data. The processor (14) is adapted to modify the access control data in the control memory (17) to allow additional access, independently of the central controller (1). <IMAGE> |
