you can't drag n drop from the active screen to inactive screen,just tried it again to verify.
You are correct Doc, but we are not talking about doing that.

What we are wanting to do here is combine two ACTIVE satellite files, 1 that is ku and another that is c band into one file.
Both of our screens would be active because one screen would have the ku file on it and the other would have the c band file on it. Simply drag from one to the other to combine these two.