How do I run a program without any relationship to it?

[Pymon]

I currently have a Python console running in an infinite loop with a 1 second sleep.
I may, at some point, make it windowless, but for now I am monitoring it via the console.

So, at certain times, I wish the console to run things. Those things could be another python script, an executable, a PowerShell script or whatever one could imagine. But the main thing being that it have no relation to the Python application that launched it. And this is only for the fact that I am concerned about memory issues if things don't get cleaned up.

Thank you, Jef. I will look into the sub process module.