3.x and 2.x on same machine (is this info at Python.org??)

[rantingrick]

Hello,

Currently i am using 2.6 on Windows and need to start writing code in
3.0. I cannot leave 2.x yet because 3rd party modules are still not
converted. So i want to install 3.0 without disturbing my current
Python2.x. What i'm afraid of is that some SYSVARIABLE will get
changed to Python3.0 and when i double click a Python script it will
try and run Python 3.x instead of 2.x. I only want to run 3.0 scripts
from the command line... > python3.x myscript.py

So how do i do this? Is my fear unfounded?

Thanks