  exist
  Builtin Function



      SSyynnooppssiiss
        Check the existence of a variable.

      SSyynnttaaxx
        exist ( _V_A_R )

      DDeessccrriippttiioonn
        The exist function returns TRUE (1) if _V_A_R exists, and FALSE
        (0), if _V_A_R does not exist. _V_A_R is any valid variable name.

        If you need to know if a variable exists, and if it is a
        function or data, then use the exist function in conjunction
        with the class or type functions.


     SSeeee AAllssoo
        class, type, who, what












































