INT 17 - Alloy NTNX,MW386 - SET TAB EXPANSION                                   
	AH = 9Ah
	AL = mode
	    00h NTNX compatibility
		DX = NTNX printer number (see #00643)
			(FFFFh = current logical LPT1)
	    01h MW386
		DX = MW386 printer number
	CL = tab length (00h = no expansion, 01h-63h = spaces per tab)
Return: AL = status (see #00642)
Note:	beginning with MW386 v2.0, tab expansion is set on a per-printer basis
	  rather than a per-user basis; NTNX and MW386 v1.x ignore DX
SeeAlso: AH=A4h