Int 2F Fn 1607  - Ms Windows - Virtual Device Call Out Api                 [W]

   AX = 1607h
   BX = virtual device ID (see #2329)
   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=1607h/BX=0018h,AX=1684h"DEVICE API",AX=C020h