Question about the character select screen

[kavren]

I have made characters on my local intranet server and also have made different accounts. Sometimes I will log in under a different account and see the characters I made with a previous account.

Also, It seems I can log in with an account that has been bound to a different I.P inside the Accounts table in MYSql.

I was wondering, how do accounts and characters interact with each other and how are they are bound to each other? Mostly I am wondering this because my server is kinda wonkey.