INT 6F - 10NET - CHAT                                                           
	AH = 0Ah
	DS:BX -> control parameters (see #03764)
	DS:DX -> chat message (see #03765)
SeeAlso: AH=04h"10NET",AH=8Ah


Format of 10NET chat control parameters:
Offset	Size	Description	(Table 03764)
 00h  8 BYTEs	sender ID, defaults to node's userID if nulls
 08h  8 BYTEs	destination user ID, 'EVERYONE' may be used
 10h 12 BYTEs	destination node ID


Format of 10NET chat message:
Offset	Size	Description	(Table 03765)
 00h	WORD	length+2 of following text
 02h  N BYTEs	text, max 101 bytes