User:Guest
From Wikipedia
Guest account for enabling people with no account experience registered users "privileges". Use it how you want, even you can try to edit its talk (I made tests of when was activated the message "You have got new messages"). It also has a JavaScript button bar, using Wikimedia support.
- Password: guest
For any annoyance may cause this account, refer to Nethac DIU, its creator.
Button bar code can be viewed and modified here: User:Guest/monobook.js (only works under monobook skin). Style sheet (used for repetitive styling): User:Guest/monobook.js.
Remember you need to register in Guest account to edit those two pages.
To see the original creators from button bar, please see User:Guest/monobook.js