First off are you looking for codes for the tv remote or the dish remote ?

Yes you neen one input to come from tha sat to go to the video in on the tv and a completely different source (signal) from off air , cable , DSS , VCR , dvd or whatever to another input on the tv .hit pip and pick your source.
Your dish can't tune in two stations at once so you would need a second reciever if that's your choice .