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Int 2F Fn 1607 - MS Windows - Virtual Device Call Out API [W]
AX = 1607h
BX = virtual device ID (see INT 2F/AX=1684h)
CX = (usually) callout subfunction
Return: (usually) AX,BX,CX,DX,ES contain results
Notes: more of a convention than an API, this call specifies a standard
mechanism for Windows enhanced-mode virtual devices (VxD's) to talk
to DOS device drivers and TSRs
see below for details on several virtual devices
See Also: AX=1605h,AX=1607h/BX=000Ch,AX=1607h/BX=0014h,AX=1607h/BX=0015h
See Also: AX=1684h,AX=C020h
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