INT 7E - XLOAD - INSTALLATION CHECK                                             
	AX = 5857h
	BL = 57h
Return: AX = 0000h if installed
Program: XLOAD is the LOADHIGH-equivalent from Helix Software's Netroom
SeeAlso: AX=5857h/BL=5Ah,AX=5857h/BL=5Bh