First make a steam account.
Go to the store page, search for a game you wish to purchase.
Once the said game is found, click the "purchase" button.
And steam will tell you the rest from here.
I always use Paysafecard to buy games from STEAM because I don't have a credit card nor PayPal account, so it's very convenient for me.
If you want to pirate them - The pirate bay. If you want to buy them - STEAM
Yes you can, you import and add non-steam games to your Steam library. From within the library you can launch and run any games, although 'Steam achievements' will only be available for Steam enabled games.
Yes, some. Not all of them can be activated on Steam. See the related links for a list of the games that can be activated on Steam and for the instructions on how to activate a game on Steam.
You can't.
No, but there is a steam function to add non steam games on to your library.
steam site
Yes, but it's free.
It is an addon that you buy from steam to use with other games to give them more features.
If you want the game download a program called Steam. With Steam you can buy games and other stuff. Steam is also legal to use because you just buy games. Anyways with steam click on STORE then search Dungeon Defenders. Buy it, then install it and your ready to go from there
Steam is a site where gamers can buy games for their computers. The forums cover a wide range of topics, mostly about the games that are sold on Steam.
The cheapest laptop that you would buy to run Steam games would be a Samsung Rc512-S02 laptop.
You can buy from many place EB Games, Game, Target, Big W if you want to buy online I recomment steam ( a program where you can chat with friends buy games and it all sorted out)
You must buy them or use a hack to get them illegaly. I will not provide a link.
If you want to pirate them - The pirate bay. If you want to buy them - STEAM
You can buy the game off of Steam. You require a Source SDK game to run Garry's Mod, but Steam sells these games.
The program Steam allows you to buy it, and many other games. go to steampowered.com to download Steam, start Steam, search for Portal, hit Purchase Game, and download it
An app that you don't have to buy, so its free. You buy video games on it, some are free and some aren't.