INT 21 - Software Carousel - GET PARTITION NAME                                 
	AX = DF04h
	BL = task number
Return: AL = status
	    00h Carousel not running
	    01h successful
		CX = length of name (00h if default partition name)
		ES:BX -> partition name (if CX nonzero)
	    FFh unsucessful
		AH = error code (01h) (see #01813)
SeeAlso: AX=DF06h