Torchlight I

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Can someone tell me how can i play torchlight 1 online? I have a friend that can play it online and i saw in a thread of runicgames saying that has the second torchlight now the first can be played online too. I bought the game 2 years ago just in case you think im a pirate and you think that, its because of that i can't go online with it. Thanks for your help :)