It is a type of information retrieval service in which a subscriber can access a remote database via a common carrier channel , request data and receive requested data on a video display over a separate channel .
Viewdata is a Videotex implementation .
Viewdata is a implementation of information retrieval service in which a subscriber can access a remote database via a common carrier channel , request data and receive requested data on a video display over a separate channel .
Viewdata is a Videotex implementation .