where to store users and logs

I have started to design the PHP Registrar Web Interface. Just want to ask one simple question, i think i know the answer, but want to be sure: In our system we want to have different users, for example: Administrator Office employee And also every person who creates one domain, is a user, who will get a username and password. Should we register these users and logs for these users action in our PHP Registrar Web Interface program, or is it possible to register it in the FRED database ? What would you recommend ? regards Petur ________________________________ This email and its attachments may be confidential and are intended solely for the use of the individual to whom it is addressed. If you are not the intended recipient or authorized to receive information for the intended recipient you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited. If the email contains proposals, they are valid for 30 days following the date of email transmission. Finally, the recipient should check this email and any attachment for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by email.