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

   VxD = 0021h

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 0985)
Values for PAGEFILE (VxD ID 0021h) service number:
 00h   get version
 01h   init file
 02h   clean up
 03h   grow file
 04h   read or write
 05h   cancel
 06h   test I/O valid
 07h   "Get_Size_Info"
 08h   "Set_Async_Manager"
 09h   "Call_Async_Manager"

See Also: #0984,#2348 at INT 2F/AX=1684h/BX=0021h