Int 20  P - Microsoft Windows - Vdd - Vxd Services                         [W]

   VxD = 000Ah

Note:  the desired VxD and service number are identified by the data
     immediately following the INT 20 instruction, as in:
       INT 20h
       DW  service number
       DW  VxD identifier

See Also: INT 2F/AX=1684h"DEVICE API",INT 30"Windows",#0961,#1032

(Table 0969)
Values for VDD (VxD ID 000Ah) service number:
 00h   get version
 01h   PIF state
 02h   get GrabRtn
 03h   hide cursor
 04h   set VM type
 05h   get ModTime
 06h   set HCurTrk
 07h   message clear screen
 08h   message foreground color
 09h   message background color
 0Ah   message output text
 0Bh   message set cursor position
 0Ch   query access
 0Dh   "VDD_Check_Update_Soon"
 0Eh   "VDD_Get_Mini_Dispatch_Table"
 0Fh   "VDD_Register_Virtual_Port"
   DX = base I/O port number
   CL = number of contiguous ports???
 10h   "VDD_Get_VM_Info"
 11h   "VDD_Get_Special_VM_IDs"

   Return: ESI = ???
       EDI = ???
 12h   "VDD_Register_Extra_Screen_Selector"
 13h   "VDD_Takeover_VGA_Port"
   DX = VGA I/O port number (03C2h, etc.)
   ECX -> routine to call on I/O access

   Return: ECX -> previous handler (to be jumped to at end of new handler)
 14h   ???
 15h   ???
 16h   ...last service for Windows95 SP1

See Also: #0968,#0970,#2335