It's simple: Look at behavioral patterns.
Think of what they would do in the situation, and if the conclusion meshes, it's most likely them.

Some people are very good actors, though.

Everyone slips up sometimes.

I would go so far as to say that they should be locked into a name unless they contact Francis to change it. The entire point of User boards breaks down when people start changing names.

that's why the "silver zephyr" only changes it between this, psycrow, and balrog

I will be adding a "username" field, which must be unique, so it will help you know who is who.

Good, good.