PSIP -  (Program & System Information Protocol) - A part of the ATSC digital television specifications that enables a DTV (digital TV) receiver to identify program information from the station and use it to create EPGs (Electronic Program Guides.)  Microsoft WebTV for Windows is an EPG.  The PSIP generator inserts data related to channel selection and Electronic Program Guides into the ATSC MPEG transport stream. https://en.wikipedia.org/wiki/psip