The fields that can be unified in
)unifies T with
)unifies S with the serial number of the last request processed by the server.
)unifies B, a boolean value, with one of
)unifies D with the ProXL Display the event was read from.
)unifies D with either the ProXL Window or ProXL Pixmap that was the destination of the graphics request.
)unifies M with the name of the graphics request that produced the event . One of
)unifies M with an integer giving the request minor code.