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 # Internal services

 Last update: 17.04.2026 

In addition to the external services specified in the JSON file specified by the --remote\_session\_config option, websocketserver support the notation of internal, built-in services. Two such services are currently defined: 'ensight' and 'envision'. The --local\_session command line option specifies the number of each of these services websocketserver will make available. For example: --local\_session ensight 2 will make two instances of EnSight available. The local session is created by launching the associated application on the local computer and the vnc server will be made available over the websocket protocol as per the external services described previously.