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 E with the ProXL Window that selected the event.
)unifies W with the ProXL Window that is being mapped.
)unifies F, a boolean value, with one of