Allowing anonymous users to see and edit their existing Profile form data

When Contacts with no user record or non logged in users view a profile form they will have the option to enter their email address and the system will check if this exists for contacts in the system.
If it does, an authenticate link (checksum) is sent via email to the contact. When the link is opened the Profile form is then filled with the contacts existing details.

• Wiki page; http://wiki.civicrm.org/confluence/display/CRM/Allowing+anonymous+users+to+see+and+edit+their+existing+Profile+form+data
• Blog page (with any comments); http://civicrm.org/blogs/gibsonoliver/allowing-anonymous-users-see-and-edit-their-existing-profile-form-data