Emacs what is the file structure of aspell personal dictionary

Question

I like to keep my Emacs init.el file under version control/synced to the web so I can pull it down from multiple computers. I have just started using M-x ispell (which confusingly I'm pretty sure is invoking aspell, whatever the difference) to check my spelling and have begun adding to my personal dictionary of words that should not be recognized as errors. How do I now use this dictionary on another computer? I guess I can break the question up:

1. What files does aspell generate on my machine that pertain to my personal dictionary and what of these files will I need to keep under version control to use on another machine?
2. If I simply copy them to the same directory structure on another machine (potentially different OS) should I expect it to magically recognize my personal dictionary words?
3. If the answer to 2. is "No", what do I need to do/configure to tell aspell "hey, this is my personal dictionary file(s) you should be checking against"?

Answer 1

Here's my config:

(setq ispell-personal-dictionary (concat emacs.d "ispell_dict"))

emacs.d is a string that stores site-lisp directory. On my current machine it's "~/Dropbox/source/site-lisp/". As long as a set it up properly on different machines, the dictionary will sync.