gtk:widget-support-multidevice (widget)

widget -- a gtk:widget object
support-multidevice -- true to support input from multiple devices

The gtk:widget-support-multidevice function returns true if widget is multidevice aware. The (setf gtk:widget-support-multidevice) function enables or disables multiple pointer awareness.

If this setting is true, widget will start receiving multiple, per device enter/leave events. Note that if custom gdk:window objects are created in "realize", the gdk:window-support-multidevice function will have to be called manually on them.