INT 15 - Rational Systems DOS/4GW - INITIALIZE PROTECTED-MODE INTERFACE AX = BF05h BX = PSPsee Program Segment Prefix segment of extender Return: nothing??? Notes: if BX is not the PSPsee Program Segment Prefix segment of the extender, it passes the call down the INT 15 chain; this allows nested instances of the extender calls INT 67/AX=DE01h if ???