Type "afk" if you plan to be away from your keyboard for a short while.
Type it again when you return.
When your afk flag is set, other characters who attempt to contact you via the
commands will receive a polite message informing them that you're temporarily unavailable.
Remember to type "afk" when you return to your keyboard!
Note that the inactivity timer continues to run, regardless of your afk setting.
This is for the safety of your character.
The afk command is a courtesy to other characters letting them know not to wait for your reply.