To Alt+Tab between them as necessary, just as we've been used to in all previous messaging programs, at least until Skype decided to remove them as well...
Guess I should have been more clear about that last post. I was just overwhelmed by the fact that it was real. All of those games in the bundle are ntr games. And as I'm sure many people will agree, ntr isn't a pure romance kind of thing. Then they make this bundle called Neverending True Romance. The first letter of each word spelling NTR. And saying the opposite of what the games really are. Its absolute genius!