Int 6F Fn 8A  - 10net V5.0 - Chat                                          [N]

   AH = 8Ah
   DS:BX -> chat parameters (see #3448)
   DS:DX -> chat message (see #3449)

Return: CF clear if successful
   CF set on error
       AX = status (see #3411)

See Also: AH=0Ah"10NET"

Format of 10NET chat parameters:
Offset Size    Description (Table 3448)
 00h  8 BYTEs  sender's user name
 08h  8 BYTEs  destination user name
 10h 15 BYTEs  destination node (0 if broadcast-style chat)

Format of 10NET chat message:
Offset Size    Description (Table 3449)
 00h   WORD    message length
 02h  N BYTEs  chat message contents