Subj : Interrupts To : Lee Aroner From : Jonathan de Boyne Pollard Date : Mon May 28 2001 03:38 am LA> I had simply assumed that OS/2 used the same invalid int trick to LA> switch rings as Win does. The interrupt(s) used on DOS-Windows and and Windows NT aren't "invalid". They are perfectly valid. Their entries in the IDT point directly to the syscall dispatch routines. ¯ JdeBP ® --- FleetStreet 1.22 NR * Origin: JdeBP's point, using Squish (2:257/609.3) .