I don't know the ins and outs of how the window manager works, but the way it works on Linux is if I have a stack of open window terminals or programs, I can hit alt-F2 and push the window that my mouse is over to the bottom of the stack. If I hit alt-F1, it will move the terminal or program window the mouse is over to the front of the stack.
Does that make more sense?
Thanks for any help.