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Int 15 Fn 12 - Topview - Send Message - "subfrom" - Send Mailbox Message [Q]
AH = 12h
BH = 0Bh
BL = mailbox to write to
00h handle is DWORD on top of stack
02h default mailbox of task whose handle is on top of stack
03h current task's default mailbox
STACK: DWORD status (low byte)
DWORD length of message
DWORD address of message
Notes: only a pointer to the message is stored, but the write may still fail
due to insufficient memory
under DV 2.2+, failed mailbox writes may return CF set (see AX=DE15h)
See Also: AH=12h/BH=0Ah"MAILBOX"
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