You are logging in to identify yourself for any PEAC System® utilities. These include working links under membership requirements, and such. You can access reports, previous or current, check out other services and the like.
Your ID will provide a nicely formatted email to send to the candidate, but only you or whom you designate can retrieve the results... and only when paid for as you go.
Password allows access to sensitive candidate information. Do not share it! It is too easy to let the admin personnel do this work for you, but therein lies a serious security problem. Please, heed the warning. In a corporate environment, simply change the password with each lost or newly assigned HR or agent.