A comma-separated list
                           of installed plug-ins and adapters, for example: 
                         Burn: The Burn renderer.  Command Line Tool: The
                           Backburner cmdjob command-line plug-in allows you to submit batch,
                           executable, or script files to Backburner as “custom” jobs. 
                         mio: The MIO adapter
                           is the processing engine responsible for carrying out transcoding
                           jobs. 
                         Wire: Installed with
                           Stone and Wire. Can be used to import/export media, perform Wire
                           transfers, etc. Used by the Wiretap SDK’s background I/O tool, wiretap_bgio_tool. 
                         
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