i am working on a Security Program i have everything i need for it except i need these next questions answered. Please help.

1. I need to detect which user is on, if its not the right user i need it to stop any applications that are loading except for windows (which should already be done) and my app. is there any way to do this?

2. i need to stop the user from clicking outside of my app, but they still need to click inside my app. Any way to do this?

3. i need it so that they cant double click the title bar (to make app larger or smaller)

Thanks