INT 15 - Rational Systems DOS/4GW - UNINSTALL???
AX = BF03h
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: 15BF06

15BF03 - Rational Systems DOS/4GW - UNINSTALL???