A fairly complicated example of what you can do is with a commit message of:
“Changed blah and foo to do this or that. Fixes #10 and #12, and refs #12.”
This will close #10 and #12, and add a note to #12.
Ok, maybe I should learn how to use SVN.
Edit 1: I’m installing it again to check if there is a way to force users to register before getting tickets. If someone already tried that, please, drop a note.