SETTRIG expression [ , expression ]

   Synopsis:
      Adds a dependent trigger

   Notes:
      A convenient way to create a trigger that launches another Axbasic script
         (or notifies this script's parent task) whenever it fires.
         
      The first expression is the stimulus (a pattern). Axmud automatically
         assigns its own name to dependent triggers.
      If the second expression is specified, it should be the name of an Axbasic
         script to run immediately (without a parent task) when the trigger
         fires.
      If the second expression is omitted, this script's parent task receives a
         notification when the trigger fires. Axbasic provides several intrinsic
         (built-in) functions for getting information about these notifiacations
         (see the help for NEXTIFACE for more information).
      Also see the help for WAITTRIG.

   Examples:
      SETTRIG "The orc kills you"
      SETTRIG "You are ready to cross the bridge!", "cross_bridge"
