Co-op on different platforms? (Borderlands 2)

No,of course, there's even different versions.

no. But I have heard that with the help dances with a tambourine and Fig shitload of emulators on their computers askance crooked maybe something will come of it, but this is untested and just a rumor

No , you can't !
In this case, will not help any one emulator and the connection between two very different sources will not be !

What if the ps3 and xbox 360?