Shared Powerpoint file with an automatic VBA saving

Shared Powerpoint file with an automatic VBA saving

I'm trying to make a Powerpoint quiz for a company that will share it on
its network drive where everybody should have access to.
The idea is every employee could participate in quiz and after answering
all the questions, the score is saved to the last slide and all the scores
are listed for the current employee.
I already know how to make the quiz part of that but I have not found a
single tutorial how to do the saving thing –– add score to the last
slide's list and save the file.
Is this doable? Can the file in the network drive be updated, saved with
VBA, so that whoever opens the file next, will see all the scores on the
last slide?
I was first thinking of auto emailing the result but then figured it out
that it's not possible.
Does it matter if there's Windows and Mac users (don't know if there are
any mac users)?
thanks in advance