Int 15 Fn BF06  - Rational Systems Dos/4gw - ???                           [E]

   AX = BF06h
   BX = PSP segment of extender
   ???

Return: ???

Note:  if BX is not the PSP segment of the extender, it passes the call down
     the INT 15 chain; this allows nested instances of the extender

See Also: AX=BF03h