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   Within the symbols environment, an alphabetically ordered list of all the
   fields, variables and defined functions of the application is displayed.
   The buttons available at the bottom of the screen filter the displaying of
   the data in the window according to homogenous types:

     . Fields. Filters the data displaying only fields.

     . Variables. Filters the data displaying only variables.

     . Functions. Filters the data displaying only functions.

     . All. Displays all the symbols, removing all pending
       filters.

     . Indexes. Display all the index files defined.

   Let's now examine the different buttons.