INT 15 - TopView - SEND MESSAGE - "LOCK" - REQ EXCLUSIVE ACCESS TO RESOURCE

Input

Output

AX

 12h       AX

BX

  14h Object     BX

CX

         CX

DX

         DX
ES:DI     ES:DI 
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

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


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