Save As redirect on Netork

[ArsirusUK]

Hi I`m an Administrator in a School.
The kids in our School keep corrupting the programme.
This is because they are saving over keys files.
They have to have access to the C: encase their Network connection goes down.
This kicks in, in an emergency, they do not have general access to c:

But the default Save directory for Python is it`s own save directory in C: by default every time it loads.
How do I change this to their local directory on the N: Drive

Cheers