This option is how you inform Emacs whether the window manager transfers
focus when the user moves the mouse. Non-@code{nil} says that it does.
When this is so, the command @code{other-frame} moves the mouse to a
-position consistent with the new selected frame.
+position consistent with the new selected frame. (This option has no
+effect on MS-Windows, where the mouse pointer is always automatically
+moved by the OS to the selected frame.)
@end defopt
@node Visibility of Frames