INT 17 - DOSISODE to WATTCP TSR Interface - INSTALLATION CHECK

	AX = 0E00h
Return: CX = 1234h if installed
Program: DOSISODE is the ISO developers environment which has been ported to
	  DOS and will run with the Waterloo TCP turned into a resident TSR.
	  Currently it allows a maximum of 6 open sockets.
Note:	this function is used to check if the interface is loaded
SeeAlso: AX=0300h"DOSISODE",AX=0A00h"DOSISODE"