pears.Semaphore - Used to police a locked section of code by using the db transaction mechanism. E.g. to make sure only one user is batch creating timesheets at a time.
pears.SentCVs - Records of which candidates CVs were attached to particular contact events.
pears.StudentVacation - Contains the start and end dates of standard student vacations. Used when matching candidates with vacation availability / unavailability.