INT 15 - TopViewTopView, DESQview, TaskView, OmniView, other compatibles - SEND MESSAGE - "ADDR" - GET HANDLE OF MESSAGE SENDER
	AH = 12h
	BH = 03h
	BL = object
	    00h mailbox handle in DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address. on top of stack
	    02h sender of last msg read from mailbox (task's handle on stack)
	    03h sender of last msg read from current task's mailbox
Return: DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address. on stack is task handle of message sender
SeeAlso: AH=12h/BH=00h,AH=12h/BH=83h
                                                                                

INT 15 - DESQview v2.26+ - "CONNECT" - CONNECT TWO WINDOWS
	AH = 12h
	BH = 03h
	BL = window to be connected
	    00h handle of window to be attached in DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address. on top of stack
	    01h attach current task's main window
	STACK: DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address. handle of window to attach to or 00000000h to detach
Return: STACK popped
Notes:	when two windows are connected, both will move if the user moves either
	multiple windows may be attached to a single window, but each window
	  may only be attached to one window at a time
SeeAlso: AH=12h/BH=83h