specifies the number
of mouse buttons, ranging from 0 to 3. If number-of-buttons is 0 or 1, the KEYS windows lists no mouse buttons (because the
left, and in this case the only, mouse button is reserved by SAS).
If number-of-buttons is 2,
the KEYS window lists the right mouse button
(RMB), as well as Ctrl + right mouse button and Shift + right mouse
button. If number-of-buttons is 3, the KEYS window lists both the right
mouse button and the middle mouse button.
Details
Unless you specify the
NUMMOUSEKEYS system option, SAS assumes that three mouse buttons are
available. If you have a one- or two-button mouse and want the KEYS window to reflect this configuration, specify the
NUMMOUSEKEYS system option in your SAS configuration file.