Afterthought (more likely): are you sure they are not "embedding" classical 
lock - unlock screen around your command ? If you have

command mainStuff
  lock screen
  <stuff>
  doChanges
  unlock screen
end mainStuff

 command doChanges
    lock screen for visual effect in rect tRect
    <show some stuff, hide some stuff>
    unlock screen with visual effect push right very fast
 end doChanges

The screen would be unlocked in mainstuff and only then what occurs in 
doChanges would show.

J.

******************************************
Prof. Jacques Hausser
Department of Ecology and Evolution
Biophore / Sorge
University of Lausanne
CH 1015 Lausanne
please use my private address:
6 route de Burtigny
CH-1269 Bassins
tel:    ++ 41 22 366 19 40
mobile: ++ 41 79 757 05 24
E-Mail: jacques.haus...@unil.ch
*******************************************


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