Getting-Started/Installation-and-Testing.md

@@ -85,6 +85,40 @@ The native libraries should be in the following location
 
 ## Installing Jupyter
 
+In order to use BoSSS properly, 
+a working installation of **Jupyter** (aka. Jupiterlab, Jupyter-Notebkook, etc.) is required.
+Prior to the migration to .NET5, BoSSS used its own custom notebook format (`bws`, for BoSSS work sheet) and featured a notebook/worksheet editor embedded in [BoSSSpad].
+Since Mid-2020, [dootnet-interactive](https://github.com/dotnet/interactive) 
+is supported by **Jupyter** and 
+reached a level
+of maturity so that it can replace the custom BoSSSpad solution.
+Although a dependency on an additional software component is a drawback 
+(e.g. the user has to install and configure it) 
+the advantages of an widely-used of-the-shelf solution
+outweigh the disadvantages. 
+
+
+Provided that Python is already installed, one can install Jupyter by
+```code
+pip install jupyterlab
+```
+resp.
+```code
+pip3 install jupyterlab
+```
+probably best as `root` or with administrator rights.
+This works in similar for Linux and Windows.
+
+* Further details can be found in the [Original Documentation](https://jupyter.org/install).
+* An alternative to the manual installation is the use of the 
+  semi-commercial [Anaconda Python distribution](https://www.anaconda.com/products/individual)
+
+Once Jupyter is installed, it can be started/tested by launching a web browser (e.g. Firefox)
+and running either `jupyter-lab` or `jupyter-notebook` from a terminal.
+The GUI should then open in the browser.
+
+For a first install, only Python notebooks are available in Jupyter. The Support for C#,
+resp. `dotnet-interactive` must be added. 
 
 
 ## Notes on Third-party libraries