INT 2F U - SuperStor PRO 2XON.COM - INSTALLATION CHECK                          
	AX = F800h
	CX = 4455h ("DU")
	DL = 45h ("E")
Return: AL = FFh if installed
	    ES:BX -> ASCII signature "Universal Data Exchange"
Program: SuperStor is a disk-compression program by Addstor.
Note:	returns AX=0001h if AL is not 00h or 01h
SeeAlso: AX=1001h,AX=F801h