so, your full code will be this:
code:
if INGROUP("GL helpdesk-telebilling")
$override = "helpdesk.telebilling.dk;"
endif
if INGROUP("GL Servicerufnummern")
$override = $override+"www.ihre-servicerufnummer.de;"
endif
if INGROUP("GL Call Center")
$override = $override+"www.teleauskunft.de;www.bankleitzahlen.de;"
endif

$override = $override+"nc*;192.168.*;*.nordcom.net;10.2.6.7;jurcom5.juris.de;www.alexanderschneeweis.de;<local>"
$nul=Writevalue ("HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings","ProxyOverride",$override,"REG_SZ")
and it works for all.
even if the user is member of all groups.
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