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 # Builtin service operation

 Last update: 17.04.2026 

Websocketserver allows for some pre-configured services, including EnSight and EnVision to be used. This can be used to support 3D remote graphics using EnVision like this:

- Launch websocketserver serving up some web pages (http) on port 28000 and the web socket protocol on port 28001:

```sh
bin\cpython.bat nexus###\nexus_launcher\websocketserver.py --http_directory nexus### --http_port 28000 --client_hostname localhost --local_session envision 4 --verbose 1 28001

```

- In a web browser, browse to this URL:

```
http://localhost:28000/ansys###/nexus/test/viewer_test_vnc.html

```

The testing web page will be loaded. The upper panel displays a proxy image which may be clicked to launch a new EnVision session. The lower panel will automatically launch an EnVision session, interactively viewing a 3D dataset.