I've thought about this a bit myself, but never bothered to ask. It must make a random hwid for each account, and it probably remembers a unique hwid with each account. If not, each time logging in it would require a "new computer" access code from email to log in. So each account must use the same hwid each time because it is remembered, so it doesn't seem to make new random hwid each time. I suppose it's one of archebuddy's secrets, and trion doesn't need to know