The WWW_RECRUITER role is a business role which grants access to the Recruiter Self Service module, it does not grant execution rights.
The WWW_% business roles determine which web menu and splash the employee has access to. The WWW_RECRUITER web role is tied to the RSS MAIN web menu and to the RSS_SPLASH which will display all of the Recruiter related self service functions the Recruiter has execution rights to.
