Int 15/AH=12h/BH=14h

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TopView - SEND MESSAGE - LOCK - REQUEST EXCLUSIVE ACCESS TO RESOURCE

AH = 12h
BH = 14h
BL = object
00h mailbox handle is DWORD on top of stack
02h use given task's mailbox (task's handle on top of stack)
03h use current task's default mailbox

Return:
STACK popped if BL=00h

Note: Release exclusive access by sending CLOSE message to mailbox. Access may be requested multiple times, and requires multiple CLOSEs

See Also: AH=12h/BH=0Dh

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

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