Psychtoolbox>Datapixx.{mex*} subfunction

Datapixx(‘RegWr’);

Write local register cache modifications to Datapixx immediately. All Datapixx
Set* functions do fast writes to a local register cache on the host, and all
Datapixx Get* functions do fast reads from this local register cache. RegWr
writes these cached register modifications back to the Datapixx over USB.

###See also: RegWrRd, RegWrVideoSync, RegWrPixelSync