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I have two laptops. One of them is connected to the internet via a network cable. I want to share the internet connection with the second laptop wirelessly. How can i do this without buying a wireless router?

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Have a look at this question: superuser.com/questions/44981/broadband-cable-to-wireless – Dave Webb Sep 24 '09 at 15:49
    
And maybe this one superuser.com/questions/18353/ad-hoc-network-internet-sharing – Col Sep 25 '09 at 7:25
    
What Operating System? – Move More Comments Link To Top Dec 14 '10 at 5:09

If the laptop with the internet connection is running Windows 7, you can use Connectify to share the connection. It takes advantage of Windows 7's ability to make a wireless card appear as an access point, letting other computers connect through it without the hassle of an ad-hoc network. It will set up WAP encryption automatically, as well. I've used it before; it's very easy to set up and use.

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