>>20
I don't know whether this is a feature common to all 2ch-esque boards, but in some implementations there are tripcodes and secure tripcodes. Tripcodes use a common hash (a function which takes something and gives back something which is hopefully unique to the first something, though it has no relation to the first something). Secure tripcodes add a secret key specific to the website you're visiting to the hash, so the result is unique to the website. The website >>1 is promoting provides a table of the common tripcode hash. This isn't possible with the secure tripcode, because it requires the board's secret key.
Tripcodes are used as name#password
Secure tripcodes are used as name##password.
For some reason you can combine them, as name#password##password2

For example, this post uses VIPPER#QUALITY##boon