GET RECORDER NUM (Myth Protocol)
Command arguments: none
List arguments: <ProgramInfo>
Asks the backend for the recorder that is actively recording the program info passed in. The host address and port returned may not be on the originally queried host, if slave backends are used. If the recorder is not valid, -1 will be returned for the port and the host will be "nohost". Note that this does not check to see of the recorder is busy or locked.
The ProgramInfo is a combination of a large collection of attributes. These can be seen in /libs/libmythtv/programinfo.cpp in the function ProgramInfo::FromStringList
The recorder id, the host address of the backend to connect to, and the port of the backend to connect to