Findtask$ (string)
        
   Synopsis:
      Returns the (unique) name of the first currently-running task matching the
         specified string
         
   Notes:
      'string' can be a task's label (e.g. "status" or "stat"), its formal name
         (e.g. "status_task") or the unique name of a particular task in the
         current tasklist (e.g. "status_task_17").
      If no matching tasks are found, returns an empty string.
      See also the Counttask () function.
