Pretty much is what the question says. I would like to have a development environment for development of my own "make an offer box" module, and since I have 0 clue on how to do that, I want to install some sample modules for reverse engineering. I know its backwards, buts its how I've learned computers since i was 12. Rip it apart, and learn backwards.
I digress, regardless of my reasons, I need to know if I can have just one magento_user for the cron tasks, and the file system permissions, or if I need two different users for the different home directories/ installations.