This section describes the Windows-specific variables related to the mouse.
The variable w32-mouse-button-tolerance specifies the time interval, in milliseconds, for faking middle mouse button press on 2-button mice. If both mouse buttons are depressed within this time interval, Emacs generates a middle mouse button click event instead of a double click on one of the buttons.
If the variable w32-pass-extra-mouse-buttons-to-system is
nil, Emacs passes the fourth and fifth mouse buttons to
The variable w32-swap-mouse-buttons controls which of the 3
mouse buttons generates the mouse-2 events. When it is
nil (the default), the middle button generates mouse-2
and the right button generates mouse-3 events. If this variable
nil, the roles of these two buttons are reversed.