INT 21 - LANtastic - SET MESSAGE PROCESSING FLAG
AX = 5F9Bh
DL = bits describing processing for received unsolicited messages
(see AX=5F9Ah)
Return: CF clear if successful
CF set on error
AX = error code
SeeAlso: AX=5F9Eh

See also: 215F9A

215F9B - LANtastic - SET MESSAGE PROCESSING FLAG