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

   VxD = 0048h

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 1004)
Values for PERF (VxD ID 0048h) service number:
 00h   get version

   Return: CF clear
       EAX = version (AH = major, AL = minor)
 01h   "PERF_Server_Register"
   (creates/sets a registry key for the server)
 02h   "PERF_Server_Deregister"
   end performance monitoring (deletes registry key for server)
 03h   "PERF_Server_Add_Stat"
   start performance monitoring (creates/sets a registry key)
 04h   "PERF_Server_Remove_Stat"
   end performance monitoring (deletes registry key)

See Also: #1003,#1005