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actually I don't want to pass my ssid & password of my broadband to him,but I want he use internet through my laptop via wireless. cheers

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If you are connected via your wireless card to your wifi access point, it's impossible. – netme Jul 29 '10 at 15:42
mine is connected through cable – user44509 Jul 29 '10 at 15:45

I'm assuming you mean an ad-hoc wireless network.

Directions for Windows.

Directions for OSX.

Directions for Linux.

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nope,connection is supposed to be established via wireless card – user44509 Jul 29 '10 at 16:06
Can you give us some info on what kind of laptops you have here? And what do you mean, all these options are for wireless connections between computers. – JNK Jul 29 '10 at 16:10
that s so simple, I am connected to internet via cable,my friend wants to use internet,but I wanna he uses my laptop as Base;in other words he get connected to internet via wireless – user44509 Jul 30 '10 at 15:53
All these directions will accomplish what you are after. – JNK Jul 30 '10 at 16:01

Like @netme commented, you can't use the same network interface to connect to the internet and share it at the same time. If you're connected to the internet through something different, like wired ethernet, you can then create an ad-hoc wireless network, use your computer as a router, and share that to your friend.

For your situation, I would recommend just changing your Wi-Fi ssid+pass, at least temporarily, to something you wouldn't mind him having access to.

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can you explain more for the first option – user44509 Jul 30 '10 at 15:53

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