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Int 15 Fn 12 - Topview - Send Message - "len" - Get Object Length [Q]
AH = 12h
BH = 09h
BL = object
00h handle in DWORD on top of stack
window: get chars/line
timer: get 1/100 seconds remaining before timer expires
mailbox: (DV/X) get number of bytes queued to mailbox
01h get number of chars/line in current task's default window
0Ch (DV 2.26+) get chars/line in window owning handle on top of stk
0Dh (DV 2.26+) get chars/line in parent task's window
Return: DWORD on top of stack is length
See Also: AH=12h/BH=08h
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