If you want to watch right away, Netflix is testing the 4K streaming waters with select shows (House of Cards, Breaking Bad, The Blacklist) and films (Ghostbusters, The Smurfs 2) if you own a Samsung, Sony or LG 4K TV and have a 25Mbps internet connection.
A PRN file is a special type of file which contains instructions for a printer, it tells the printer what to print on the page and where as well as which paper tray to use, what the paper size is and a number of other controls.
Resource Records define data types in the Domain Name System (DNS). Resource Records identified by RFC 1035 are stored in binary format internally for use by DNS software. But resource records are sent across a network in text format while they perform zone transfers. This document discusses some of the more important types of Resource Records.