Compatible transmission and reception of operational signals to be processed by a receiver

DETAILED DESCRIPTION It is an object of the invention to provide a method of transmitting operational signals, such that receivers having different capabilities perform different operations.
To this end, the method in accordance with the invention is characterized in that it comprises the step of transmitting level data defining first and further capabilities required to perform said first and further operations respectively.
In the Miss World contest example, this allows the broadcaster to control one type of receiver (e.
g.
, receivers having a backwards channel only) to call a respective telephone number, whereas another type of receiver (e.
g.
, receivers having also a chip card reader) can be controlled to call a different telephone number for establishing a bidirectional communication with a processing system that is arranged to debit an amount from the chip card in turn for crediting a large amount to every n-th caller.