SoftwareCommandDictionary:

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   Load the dictionary of known software commands for the DFF system.

   Since version 7.
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   Form:
   d = SoftwareCommandDictionary;
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   Inputs
   ------
   none

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   Outputs
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   d            {:,4}     Cell array of software command info
                             {name,   destination agent,  default data,  description}

                             Note: by design, all software commands contain no data

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