or "CRM" systems are used to help support personnel 'know their customer'. At a minimum, such systems provide 'contract management': they track whether a given customer has actually purchased a support contract, what type of a contract it is (regular, premium, unlimited) and how much time/incidents are left before the contract expires. They frequently rate customers by importance, priority, friendliness, and special treatment the customer may need. CRM systems are usually integrated with Help-Desk/Call-Tracking systems (below). At the low-end, CRM systems are no more than glorified address books, such as the contact management systems that salesmen use to collect and scan through sales leads.