DMXSync()
flushes all pending protocol requests between the
Xdmx(1)
server and each back-end X server. It is used by clients that talk
directly to back-end X servers to ensure that all pending
Xdmx(1)
requests have reached all back-end servers and have been processed by
those servers.
RETURN VALUE
DMXSync()
returns
True
unless there is a protocol error.