what does --sync do?

[Peter Jay Salzman <p dirac org>]

i've read:

   -sync
   Make X calls synchronous. This slows down the program considerably,
   but may be useful for debugging purposes.

i don't understand this.   what does it mean to make X calls
synchronous?

i think i remember reading that in order to save "bandwidth", X will
sometimes cache events.  does --sync force X to send event as they occur
and not cache them?

pete

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