EXIT  return to main menu. You can bypass the main menu by selecting
      ahead, e.g. 'e 0 2' is equivalent to typing 'e', then typing '0 2'
      from the main menu.

AGAIN repeats the current screen.
AGAIN <count> repeats the current screen <count> times. Use a <count> of 0
      to repeat the screen indefinitely (until the escape key is hit).

MORE  if there are more objects to be viewed for this layer, type MORE to
      view the next screen.

CLEAR <object-id> does a read-and-clear of the specified object. If you don't
      specify an <object-id>, you will be prompted for one. The object id's
      are the 4 digit hex numbers enclosed in brackets. Type CLEAR ALL to
      read-and-clear all object being viewed (you are likely to get error
      messages because many objects can't be cleared).

SET   <object-id> <value> sets the specified object to the specified value.
      If you don't specify <object-id> or <value>, you will be prompted for
      them.

All commands can be abbreviated to their first character.
$
INTERVAL <time> specifies a time interval between repetitions of screens
      due to an AGAIN <count> command. The default time is 0.

      example:
      'INTERVAL 2 AGAIN 0' causes the current screen to be repeated
      indefinitely at 2 second intervals.

Note that an AGAIN following a CLEAR ALL repeats the CLEAR ALL function.