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AH = FCh
Return:
ES = segment of virtual screen
Desc: Determine the address of the virtual screen to which the program should write instead of the actual video memory, so that the multitasked programs do not interfere with each other's output.
Notes: Screen address can change if task-switching is on!. Identical to AH=ECh
See Also: AH=ECh"DoubleDOS" - INT FC"DoubleDOS"
Category: DOS-Based Task Switchers/Multitaskers - Int 21h - D
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