Different Shells/Users Question

Afternoon All!

Quick question about different shells for different users.

Currently, this functionality works fine for me except that when I exit
my custom shell, my system sits at a very nice light blue screen (a
default background I think). Cntrl-Alt-Del brings up the Task Manager
(this is OK). What I would like to happen, is if you exit the custom
shell application using Cntrl-F4, I would like the system to reboot.

My custom shell is actually an IE browser window.

Any thoughts?

Thanks!!