For most full screen games, if another window pops up and becomes *ACTIVE* (and thats important), then the game window will minimize. F4Glass (for example) does not activate the window AFAIK (i.e it never gains the screen focus).
I had major problems with this early on with TB until I discovered the NOACTIVATE flag on the window. As soon as anyone pressed the screen in local mode, the full screen games would minimize and stay there... no good to anyone really. If I set NOACTIVATE on the TB window, then the window still gets cursor/mouse events, but is unable to gain "focus" or become the active window, not can it receive keyboard events.
The sendto options are there to be used if required, but if you have windows opening that grab focus while gaming, your biggest problem would be your game minimizing
