Supporting Python 2.x and 3.x on a PC

[Doug Stell]

I support multiple projects, some of which will remain on Python 2.x
and some of which want to use Python 3.1.2. While I have installed
both on my Windows PC, only the last installed version can be used. I
do not have admin rights on the machine, so altering registry settings
is not an option. Any guidance on how I can select between the
versions?

Thanks