INT 03 - Watcom WVIDEO, Watcom WD - OUTPUT DEBUGGING MESSAGE

	STACK:	DWORD	selector
		DWORD	offset of ASCIZ message to display
Notes:	the INT 03h instruction which invokes the debugger must be followed by
	  a JMP SHORT and the signature string "WVIDEO"
	to check whether this interface is available, define a public byte
	  variable named ___WD_Present, which the debugger will set to 01h
	  before running the program
SeeAlso: AX=0910h