Someone is a bit adventurous eh?
Bittorent - a file sharing p2p. With a bittorent client (eg bitcomet/utorrent) you can download any program/file/movie/ebook/music/etcetc hosted on a torrent website for free. Some say this is illegal, some say sharing is caring *cough*. So it's up to you if you want to use this.
Logmein - A program that enable you to control another computer where you have installed it. For example if I install this program in your computer, I can take control of your computer whenever I want from my own computer. So for security purpose, better find and uninstall this program from your computer asap.
Those are my tl:dr version. I'm sure someone will write an essay for you later.