PHP Authentication is a web service accessed via POST requests, producing XML output. It supports the following operations: register, unregister, verify account, log in, log out, request login data, get current user name, set private data, get private data, send invitation, get remaining invitations, delete expired data. Completely customizable, easily integrates with the client side. Read more about the product here: http://www.phpauthentication.net/ Invitation link: http://secure.plimus.com/jsp/developer_login.jsp?affReqId=664B0CCBD3894A8F