Change an app from "all users" to "this user only" I've been on my mac for quite a while now, using only a single account (mine).

I've added a new account for my girlfriend recently (yes it's getting serious), but I have a little problem. 

I'm a physicist and therefore use a lot of domain-specific apps (matlab, macvim, latex, ...) which my girlfriend doesn't need. 

How can I change these apps so they only show up in my account's applications folder (I am the admin). Vice versa, I would also want that none of the apps she installs are visible on my account. 

How would this be done? Do her privileges prevent her from installing global apps?
You have two questions here. ( and ~ is short for the /Users/current_user folder)

1) For apps only to show up in your account - move them to ~/Applications 

2) If a user is not part of the Administrators group then that user cannot install apps in /Applications which is the normal place for shared Applications. Non admin users can install apps in their home folder ~ but not another user's Applications folder nor the system Applications folder.