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mov ax, 4004h       ; Exit Critical Section
int 2fh
 
Exit Critical Section notifies the virtual-display device that a VM
application has completed a critical section and can now respond to Save
Video Register State (Interrupt 2Fh Function 4005h).
 
A VM application calls this function when it has completed critical section
processing.
 
Return Value
 
This function has no return value.
 
Comments
 
Calls to Exit Critical Section not preceded by a corresponding call to Enter
Critical Section (Interrupt 2Fh Function 4003h) are ignored.
 
 
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