Category: <b>other operating systems</b>
<br>Flags: Undocumented function<p>
<pre><b>INT 21 - OS/2 v2.1+ Virtual DOS Machine - GET WinOS2 CALL GATE ADDRESS</b>

	AH = 64h
	DX = 0007h (function number)
	CX = 636Ch (magic value, "cl")
	BX = 0000h (indicates special request)
Return: AX = call gate address
Notes:	if CX is not 636Ch on entry, INT 21/AH=6Ch is invoked, because a bug
	  in OS/2 1.x FAPI erroneously called AH=64h instead of AH=6Ch
	used by WinOS2 to make direct calls to OS2KRNL, bypassing the overhead
	  of DOSKRNL
</pre>