Thank you Cyril for the link to the tutorial.

�� �� https://ci.inria.fr/pharo-contribution/job/EnterprisePharoBook/lastSuccessfulBuild/artifact/book-result/PillarChap/Pillar.html

I see that Pillar is a command line tool. The welcome example taken
from this tutorial is:

�� �� Pharo.exe Pillar.image pillar export --to=html
--outputFile=welcome welcome.pillar

How can I run a command like this from within Pharo in a "playground"
(former workspace)?

Later on I plan to construct a simple GUI with text boxes for Pillar
sources and have some buttons executing these commands.

--Hannes