Player documentation for Frontier

During the game, idle players (those who are inactive for 5 minutes or
more) are visible with the "who" command.  Idle time is presented in the
format hh:mm where
  hh - number of hours idle
  mm - number of minutes idle
Idle players will be logged off by the game after approximately 1 hour
of inactivity.  To prevent this from happening, merely execute any game
command within that 1 hour period to start the counter at zero again.
There will be a 5, 2, and 1 minute audible (on most systems) warning
to the player before logout occurs.
This also occurs for those players who are linkdead.
See Also:  who