INT 15 - TopView - SEND MESSAGE - "LEN" - GET OBJECT LENGTH

	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 (any handle on stack has been popped)
SeeAlso: AH=12h/BH=08h