List of Abbreviations xix MPEG-1, MPEG-2, MPEG-4 audio and video compression formats developed by MPEG MPEG-7 metadata format designed by MPEG ms millisecond MUD multi-user dungeon MUPE multi-user publishing environment NFC near fi eld communication NTP Network Time Protocol OCR optical character recognition ODP open directory project OMA Open Mobile Alliance OS operating system P2P peer-to-peer PC personal computer PCE personal content experience PCM personal content management PDA personal digital assistant POI point of interest PIM personal information manager PSP playstation portable PVR personal video recorder QWERTY acronym describing layout of standard typewriter keyboard QVGA quarter VGA RAM random access memory RDF resource description framework RFC request for comments RFID radio frequency identifi cation device RPG role playing game RSS Really Simple Syndication RSVP rapid serial visual presentation RTF Rich Text Format SD Secure Digital (memory card) SDK software development kit SIM subscriber identity module SMS Short Message Service SNTP Simple Network Time Protocol SQL Structured Query Language SUI speech user interface SVG scalable vector graphics SyncML Synchronization Markup Language TFT thin fi lm transistor TIFF Tagged Image File Format