[development] creating a new usermanagement things

[Kees Scherpenhuijzen]

Hey all,

When using drupal for a site where users can register themself for a
event; what is the best way to store the data when you have different
modules to manipulate them?
By manipulating i mean:
- Managing some fields like if the person have payed.
- Managing multiple users to assign them to groups
- Just show lists of users
- Printing lists of each user data

I'm right now looking a the module profile which is provided by drupal
it self. but is see it is data stored in a separate table. Is it then
the best way to create code which uses the "API" from profile? Is
there anyone who has more experience with this?

TIA,
-- 
Kees