INT 7A - Novell NetWare - IPX Driver - GET INTERVAL MARKER

	BX = 0008h
Return: AX = interval marker in clock ticks (big-endian???)
Notes:	may be used to measure the time elapsed between two events, up to one
	  hour
	this function is supported by Advanced NetWare 1.02+
SeeAlso: BX=0005h