INT 21 - TopWare Network OS v5.10+ - SEND MESSAGE                               
	AX = FF80h
	DH = FFh
	DL = destination address (FFh for broadcast)
	CX = message length (max 2000)
	DS:SI -> message to be sent (see #02530)
Return: nothing
Program: TopWare Network Operating System is manufactured by Grand Computer
	  Company
Notes:	this function is supported on both Workstations and the server
	there is no guarantee that the message will be received correctly, or
	  at all, by the destination


Format of TopWare message:
Offset	Size	Description	(Table 02530)
 00h	BYTE	type code
		07h TopSend
		11h user application
		other reserved for TopWare
 01h	var	data
Note:	sending messages with a type code other than 11h will cause
	  unpredictable results