Enrico
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Ok, it seems stupid to reply to my own question, but I just found the answer to it on "Apple IIGS Toolbox Changes
for System Software 6.0 (ERS version 2.5)" by David A. Lyons (February 26, 1992)
"Added a QDStartUp MasterSCB bit (value $0100, bit 8) that causes the screen not to
be cleared if it is already being displayed. StartUpTools uses this to avoid wiping
the screen first to black and then to the desktop pattern, when the Window Manager is
also being started up."