Int 21 Fn 5F9A  - Lantastic - Get Message Processing Flags                 [N]

   AX = 5F9Ah

Return: CF clear if successful
       DL = bits describing processing of received messages (see #1420)
   CF set on error
       AX = error code

See Also: AX=5F9Bh,AX=5F9Ch,AX=5F9Dh

Bitfields for unsolicited message processing flags:
Bit(s) Description (Table 1420)
 0 beep before message is delivered
 1 deliver message to message service
 2 pop up message automatically (v3+)