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[Pierre Quentel]

No, in the document root you create a folder "app1" and put all the
files for the first application in it, and a folder "app2" for the
second application

For http://foo.example.com/app1 the server will search for an index
file in this directory and serve it. You can also specify the script
you want : http://foo.example.com/app1/default.py. Same thing for app2
of course. Absolutely no need to start two instances of the server on
different ports

Pierre