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 W with the ProXL Window that receives the event, and is losing the selection.
)unifies S with the atom giving the name of the selection.
)unifies T with the last-changed time, in milliseconds, recorded for the selection.