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.
When you specify prn, the directory list is sent to the printer attached to the LPT1 port. If your printer is attached to a different port, you must replace prn with the name of the correct port. You can also redirect output of the dir command to a file by replacing prn with a file name. You can also type a path.