Where do I find these Active Directory values using DirectoryService?

[jmk]

Hi,

I am currently writing a vb .net 2003 program that updates values in
our AD with values stored elsewhere. Getting a list and updating values

works fine using the DirectoryServices.
And most values can be seen and updated directly, like cn, sn, title,
displayName, mail and so on. But I also need to update the values
stored under the Address and Telephone tabs in the "Active Directory
Users & Computers".
How do I get to those values?
Best regards, JanK