I just switched from windows/pc and want to know if it's possible to "logout" of an account without shutting down applications/internet connectivity. I used to be able to click "log off" (in windows) when I got up to leave my computer (for security) so that I would have to type in my username and password to get back in and applications such as AIM and internet connection were still available. Can you do this on a Mac? So far I only see options to log out completely or to put it into full sleep mode (signing you off of AIM and iChat).