INT 2F C - Novell NetWare - DOS Requester - BROADCAST/SFT3 INFORM               
	AX = 7A22h
	DL = function
	    21h ('!') broadcast waiting for workstation
	    40h ('@') SFT3 server-change inform
	BX = transport type
	    0021h IPX(Internetwork Packet Exchange) A low-level layer of Novell's NetWare networking software.
	    0022h TCP(Transmission Control Protocol) A higher level (session layer) of the TCP/IP protocol suite.  See also IP, TCP/IP.
	ES:SI -> transport-specific data block
	    (ECB for IPX(Internetwork Packet Exchange) A low-level layer of Novell's NetWare networking software., undefined for TCP(Transmission Control Protocol) A higher level (session layer) of the TCP/IP protocol suite.  See also IP, TCP/IP.)
	interrupts disabled
Return: AX = 0000h if event handled, unchanged if not
	interrupts disabled
Note:	this callback is made from within a hardware interrupt handler; a
	  separate call to AX=7A21h is made once the system is in a safe
	  state for receiving the message
SeeAlso: AX=7A21h