listing all user accounts that exist on dapper server

[Luqman]

hello,

>How do I list all user accounts that exist on a dapper server, and what
>steps or what checklist do I use to check the security of a dapper
>server from a rogue admin that has left.  The obvious is ssh and telnet
>access, but what other vulnerabilities might exist?
>

In case you like graphical solution:
--> System --> Administration --> Users and Groups

Since my system in Germany language, the above mentioned terms are my
translations and may somewhat differ on real English language
environment.

cheers,

-- 
Luqman