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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
Category: DESQview/TopView and Quarterdeck Programs - Int 15h - D
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