gdk:window-support-multidevice (window)

window -- a gdk:window object
support-multidevice -- true to enable multidevice support in window

The gdk:window-support-multidevice function returns true if the window is aware of the existence of multiple devices. The (setf gdk:window-support-multidevice) function will enable multidevice features in window.

Multidevice aware windows will need to handle properly multiple, per device enter/leave events, device grabs and grab ownerships.