Specifies the type of circuits to add to the display.  Valid circuit
  types are:

         OPEN    - Circuits in the open state.
         NOOPEN  - Circuits in the closed state or any of the
                   open-in-progress or close-in progress states.
         ALL     - All types of circuits.

  Format:  ADD CIRCUITS/TYPE=(type[,...])

  If only one type is specified, the parenthesis can be omitted.