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Call DOSMGR entry point with

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AX =
0000h get DOSMGR version
Return: CF - clear
AH = major version
AL = minor version
0001h set critical focus
Return: CF - clear
0002h crash current virtual machine
Return: never
Note: Displays message box stating that "application has been stopped by the DOSMGR device".
0003h enter critical section
Note: This function assumes that the code for INT 2A/AX=8001h and INT 2A/AX=8002h have been modified for Windows.
0004h get VM ID byte
Return: CF - clear if successful
  ES:DI VM ID byte
CF - set on error
Note: This function fails if the INT 2A modifications have not yet been applied.
0005h inform Windows of possible media change
Data: BL = drive number (00h=A:)
Return: CF - clear if successful
CF - set on error
See Also: #01282 at INT 20"Windows",#02655,#02657