Basic Packet Protocols
| FA | ASCII message |
| FB | BINARY message |
| FC | Identifies the message |
| FF | No message to send, this line must not to be followed by a F> |
| FS | The other BBS will reject, accept or defer each message ( – + = ) |
| FQ | Dsconnects |
| FW | MYCALL |
| F> | End of proposal |
| B | Bulletin |
| P | Private |
| Number _ Callsign | Message Number Identifier |
| Number | Size of message in bytes |