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Int 15 Fn DE21 - Desqview V2.26+ - "assertvir" - Control 386 Screen Virt [Q]
AX = DE21h
BX = new state
0000h turn off
nonzero turn on
Return: BX = old state of virtualization
Notes: this API call may be made from within a hardware interrupt handler
under DV 2.40 and 2.42, this call appears to have no effect and always
returns a nonzero value in BX which appears to be the offset within
the DV common memory segment of the caller's task object; it may
only have an effect within a hardware interrupt handler
See Also: AX=1117h,AX=DE17h
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