801: Set local operator. If your greeting says something like "Press 0 to talk to a human being", you can select the local assigned to the "0". Press "801", then the local operator's number, then "#".
802: Select a phone or pager number to be called when you have voice mail. Consult the user manual for details.
Get online help for the message commands.
Terminator key, used to stop recording, to terminate a password, etc.