Category: <b>DOS kernel</b>
<br>Flags: callout or callback (usually hooked rather than called)<p>
<pre><b>INT 2F - MS Windows - "DOSMGR" VIRTUAL DEVICE API</b>

	AX = 1607h
	BX = 0015h (VxD identifier of "DOSMGR")
	CX = function
	    0000h query instance processing
		DX = 0000h
		Return: CX = state
			    0000h not instanced
			    other instanced (DOS 5+ kernel returns 0001h)
				DX = segment of DOS drivers or 0000h for
					default of 0070h
				ES:BX -&gt; patch table (see <a href=../../it/37/26.html>#02637</a>)
	    0001h set patches in DOS
		DX = bit mask of patch requests (see <a href=../../it/36/26.html>#02636</a>)
		Return: AX = B97Ch
			BX = bit mask of patches applied (see <a href=../../it/36/26.html>#02636</a>)
			DX = A2ABh
	    0002h remove patches in DOS (ignored by DOS 5.0 kernel)
		DX = bit mask of patch requests (see <a href=../../it/36/26.html>#02636</a>)
		Return: CX = 0000h (DOS 5-6)
		Note:	return values are ignored by DOSMGR in Windows 3.1
	    0003h get size of DOS data structures
		DX = bit mask of request (only one bit can be set)
		    bit 0: Current Directory Structure size
		Return: if supported request:
			    AX = B97Ch
			    CX = size in bytes of requested structure
			    DX = A2ABh
			else:
			    CX = 0000h
			    all other registers preserved
	    0004h determine instanced data structures
		Return: AX = B97Ch if supported
			DX = A2ABh if supported (DOS 5+ kernel returns 0000h)
			BX = bit mask of instanced items
			    bit 0: CDS
			    bit 1: SFT
			    bit 2: device list
			    bit 3: DOS swappable data area
	    0005h get device driver size
		ES = segment of device driver
		Return: DX:AX = 0000h:0000h on error (not dev. driver segment)
			DX:AX = A2ABh:B97Ch if successful
			    BX:CX = size of device driver in bytes
Notes:	DOSMGR (DOS Manager) will check whether the OEM DOS/BIOS data has
	  been instanced via this API and will not perform its own default
	  instancing of the normal DOS/BIOS data if so; if this API is not
	  supported, DOSMGR will also try to access instancing data through
	  INT 2F/AX=1603h
	these functions are supported by the DOS 5+ kernel; DOSMGR contains
	  tables of instancing information for earlier versions of DOS
	see Geoff Chappell's book _DOS_Internals_ for additional discussions of
	  DOSMGR's behavior and instancing in general
SeeAlso: AX=1603h,AX=1605h,AX=1607h/BX=000Ch,AX=1607h/BX=0014h
SeeAlso: AX=1684h"DEVICE API"

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