You can look through the device if the software is not running
I dont think you can play the stuff on the zune on someone else's computer, but you could try the
ZuneHdPatch
to see the files in explorer(must be patched on his computer) and i think you can play it like that or copy it to his compture
or simply right click the video you want to play and click copy to collection, find it in the software and play it like that(this is the easiest way)