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(elisp)Raising and Lowering

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Raising and Lowering Frames
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   Most window systems use a desktop metaphor.  Part of this metaphor is
the idea that windows are stacked in a notional third dimension
perpendicular to the screen surface, and thus ordered from "highest" to
"lowest".  Where two windows overlap, the one higher up covers the one
underneath.  Even a window at the bottom of the stack can be seen if no
other window overlaps it.

   A window's place in this ordering is not fixed; in fact, users tend
to change the order frequently.  "Raising" a window means moving it
"up", to the top of the stack.  "Lowering" a window means moving it to
the bottom of the stack.  This motion is in the notional third
dimension only, and does not change the position of the window on the
screen.

   You can raise and lower Emacs frame Windows with these functions:

 - Command: raise-frame &optional frame
     This function raises frame FRAME (default, the selected frame).

 - Command: lower-frame &optional frame
     This function lowers frame FRAME (default, the selected frame).

 - User Option: minibuffer-auto-raise
     If this is non-`nil', activation of the minibuffer raises the frame
     that the minibuffer window is in.

   You can also enable auto-raise (raising automatically when a frame is
selected) or auto-lower (lowering automatically when it is deselected)
for any frame using frame parameters.  Note: Window Frame Parameters.