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Call IOS entry point with

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Data:
EAX = function number
0000h ???
Return: CF - clear if successful
  AX = 0000h
CF - set on error
  AX = FFFFh
0001h check if ???
Return: CF - clear if successful
  AX = 0000h
CF - set on error
  AX = FFFFh
0002h requestor services???
Data: DL = service number???
Return: CF - clear if successful
  AX = 0000h
  DX = ???
CF - set on error
  AX = FFFFh
Note: Calls "IOS_Requestor_Service" (see INT 20"Windows").
0003h ??? (copies five bytes of data internally)
Return: CF - clear if successful
  AX = 0000h
  EDX = ???
CF - set on error
  AX = FFFFh
else
Return: CF - set
  AX = FFFFh
See Also: #02653,#02655