something to select a different frame, or until the next time
this function is called. If you are using a window system, the
previously selected frame may be restored as the selected frame
-after return to the command loop, because it still may have the
-window system's input focus. On a text-only terminal, the next
-redisplay will display FRAME.
+when returning to the command loop, because it still may have
+the window system's input focus. On a text-only terminal, the
+next redisplay will display FRAME.
This function returns FRAME, or nil if FRAME has been deleted. */)
(frame, norecord)