I know, by default, server certificates in OES 2/eDir are set to expire after 2 years. Following a cool solution posted here I can see how to replace the http and ldap certificate, but are there any other certificates I need to worry about?

As stated in the above mentioned cool solution, the only services relying on that certificate are http and ldap, but in my pretty vanilla eDir, I see several other certificates, what are they used for?

Also, I'm really having a difficult time understanding the Novell Certificate Server and certificates in general. Is anyone aware of a good tutorial on the certificates basics or some practical examples on using Novell Certificate Server?