Before any of the URLs listed in Reading quotas or Modifying quotas can be used, you must establish an application session for the Quota web service. /Quota/Logon URL returns an ApplicationSessionId value that must be included in the header of all other requests.

The Quota web service uses username and ticket to log onto DPM on behalf of the user. The ApplicationSessionId (and therefore the Username/Ticket) determines the projects which the client can see or access.