INT 15 - TopView - SEND MESSAGE - "ADDTO" - WRITE CHARS AND ATTRIBS TO WINDOW

	AH = 12h
	BH = 0Ah
	BL = window to write to
	    00h window handle is DWORD on top of stack
	    01h current task's default window
	    0Ch (DV 2.26+) default window of task owning handle on top of stack
	    0Dh (DV 2.26+) default window of parent of current task
	STACK:	DWORD count of attributes
		DWORD address of attribute string
		DWORD count of characters
		DWORD address of character string
Return: STACK popped
Notes:	if one string is longer than the other, the shorter one will be reused
	  until the longer one is exhausted
	the cursor is left just after the last character written
SeeAlso: AH=12h/BH=0Bh"WINDOW"