INT 2F U - HP 100LX/200LX - PUSHKEYS - INSTALLATION CHECK                       
	AX = C0AEh
Return: AX = 4453h if installed
	CX = 5259h if installed
Range:	AH=C0h to AH=FFh, selected by scanning for signature
SeeAlso: AX=C000h"HP 100LX",AX=C001h"HP 100LX",AX=C0AFh"HP 100LX"