Int 15 Fn BFDE  - Desqview/x 1.02+ - Dvdos4gx.dvr - Check If ??? Mailbox   [E]

   AX = BFDEh
   BX = 0016h
   CX = index of ??? mailbox
       (0000h-0004h valid, but no range checking done)

Return: AX = status
       0000h no one owns mailbox
       0001h mailbox has an owner
   BX destroyed

See Also: AX=BFDEh/BX=0015h,AX=BFDEh/BX=0017h