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   To associate the unique key attibute to an index, do the following:

     . Access the Dictionary environment.

     . Highlight the file containing the index that will be
       associated the U attribute.

     . Press the Indexes button.

     . Bring the cursor in correspondence to the index desired by
       using the arrow keys, and press the Unique key button.
        This button activates, if pressed one time, the attribute or
       deactivates the attribute if pressed a second time.

     . Press F10 to return to the Dictionary environment
       frames.