To start the local server that powers the Notebooks, activate the virtual environment and pass the jupyter notebook command:

C:PythonGeospatial3>cartoenvScriptsactivate
(cartoenv) C:PythonGeospatial3>jupyter notebook
[I 17:30:46.338 NotebookApp] Serving notebooks from local directory: C:PythonGeospatial3
[I 17:30:46.338 NotebookApp] 0 active kernels
[I 17:30:46.339 NotebookApp] The Jupyter Notebook is running at:
[I 17:30:46.339 NotebookApp] http://localhost:8888/?token=5376ed8c704d0ead295a3c0464e52664e367094a9e74f70e
[I 17:30:46.339 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[C 17:30:46.344 NotebookApp]

    Copy/paste this URL into your browser when you connect for the first time,
    to login with a token:
        http://localhost:8888/?token=5376ed8c704d0ead295a3c0464e52664e367094a9e74f70e
[I 17:30:46.450 NotebookApp] Accepting one-time-token-authenticated connection from ::1
[I 17:30:49.490 NotebookApp] Kernel started: 802159ef-3215-4b23-b77f-4715e574f09b
[I 17:30:50.532 NotebookApp] Adapting to protocol v5.1 for kernel 802159ef-3215-4b23-b77f-4715e574f09b

This will start running the server that will power the Notebooks. This local server can be accessed on port 8888, using a browser, by navigating to: http://localhost:8888. It should automatically open a tab like this one when started:

If you log out, use the token provided in the text generated when the jupyter notebook command is passed to log back in, as in this example:

http://localhost:8888/?token=5376ed8c704d0ead295a3c0464e52664e367094a9e74f70e