convergence systems , or pc - tv systems , provide the combined benefits of a computer system and a television . these systems typically include audio / video recorders , such as vcrs , for recording programs , as well as an electronic program guide for presenting program information . the present invention provides methods and devices for detecting specific signals or markers associated with a program or channel signal , and then enabling a recording device or an epg to perform an act , such as recording a program , based upon the detected signals or markers . in a preferred embodiment , the system receives a channel signal , detects a program start or stop marker within the signal , and controls the epg or the recording device to perform acts corresponding to the detection of a start or stop instruction .