The Rating table in the Guide database defines rating names for individual ratings used in various rating systems. WebTV for Windows also maintains rating information in a text file called Rasci.rat in the Windows\System directory. Any time an application changes an entry in the Rating table, that application must update the Rasci.rat file with new descriptions. Each record in the Rating table is roughly equivalent to a label entry in a Platform for Internet Content Selection (PICS) rating file. The Rating table contains the following fields.