Hi BOAC,
Are you asking about sending ("streaming") normal TV around the house via your computing setup ?
If so, this is something I looked into not so long ago, but never actually put into practice because it all seemed a bit fiddly. It is possible, but probably "easer said than done" for your average home computing user (probably could be done via a Mac if you don't mind the command line).
Or have I misunderstood ?