E-Recruitment : Talent Pool & Workflows

Hi!

Can some one please guide me with the below queries..

1) does the profiles of unregistered candidate or the candidate who's details have been entered by the data entry clerk become the part of talent warehouse ??

2) can be have a workflow between requester and recruiter ? i mean once a requester raises a requisition it should be approved at two levels and then be seen on recruiter's list ?

Thanks & Regards.....