Get network account's fullname

I want to get network account's fullname, e.g, there is a user account in my PDC as below:
User name: jamal
Full name: Jamal Hooworth
Can we get full name of jamal? I have realized it use NetUserGetInfo(), but unfortunately it only support NT, unsupport Windows 9X.

Can anyone tell me how to realize it in both NT and Windows OS?

Charles

Thanks