Using a simple example: I'm trying to install ICQ for every user. As it doesn't have a good multi-user support, seems the way to do it is to install once for every user. I installed using my account, and it showed up to every user in the house. The problem is that when my brother tries to run ICQ, it'll try to register his ICQ#, recognizing that it's using a different user, but it'll run into an error message saying "couldn't create database index".
Actually, all I need to know is how to install a program for just one user, that won't show up in other user's start menu, that won't be available to others.