Remote access programs?

I just downloaded TeamViewer onto two laptops. One is my own, and one me and my roommate share. Basically what I want to do is log into the remote computer, however, it tells someone when i'm on it. I'm not trying to watch what he's doing or anything of that nature. Just pulling a prank. It just wouldn't work so well if he sees me sign in. Is there a way I can hide this or perhaps another program that doesn't notify when I sign in or out.