Turn Your Vista Laptop into a Mobile Hotspot
Sharing Internet Connections
Have you ever found yourself in a position where you have the only Internet connection on your laptop and have friends or colleagues who would like to share that connection? If you have a wireless card or built-in WLAN on your notebook and all the other laptops all have WiFi (stands for Wireless Fidelity), the solution is both easy and free.
You would need to turn your laptop into a mobile hotspot, and the other laptops need to have WLAN support. Most new laptops do come with built-in WLAN support (also known as 802.11b or 802.11g), but if you aren't sure whether the laptops do, then there are inexpensive PCMCIA cards or bus devices that could be purchased to connect to a wireless network.
Please note that these steps apply only to Windows Vista. If your laptop runs Windows XP, please go this article.
You would need to turn your laptop into a mobile hotspot, and the other laptops need to have WLAN support. Most new laptops do come with built-in WLAN support (also known as 802.11b or 802.11g), but if you aren't sure whether the laptops do, then there are inexpensive PCMCIA cards or bus devices that could be purchased to connect to a wireless network.
Please note that these steps apply only to Windows Vista. If your laptop runs Windows XP, please go this article.
5 Easy Steps - Setting up a WIFI Hotspot
To start setting up your mobile hotspot, go to Start -> Control Panel -> Network and Sharing Center and click on “Set up a connection or network.”
Step 2:
On the next dialog, select “Set up a wireless ad-hoc network.”
Step 3:
Enter a name for your new network, select WEP privacy, and set a password. Then click “Save this network." Let your friends know the name of your network, and the password to access it.
A word about the Security type – WEP is an older protocol and is not the most secure. I suggest selecting WEP rather than a stronger protocol because it will allow older laptops and handhelds to connect to your network. WEP is better in a mixed environment, and ad-hoc networks are intended to be networks of convenience, or in other words, temporary. If you have a permanent need to share an Internet connection, it would be more sensible to buy a WIFI router.
Step 4:
Click Next and select “Turn on Internet connection sharing.” This creates the wireless network and enables Internet Connection Sharing.
Step 5:
At this point, Vista is ready to share the default internet connection. This is probably the Ethernet connection, but we want to share the wireless card connection instead. On my Vista laptop, the wireless connection is called “National Access – Broadband Access.”
Again, go to Start -> Control Panel -> Network Sharing Center, and then click on “Manage network connections.” Right-click your wireless device and select “Properties.” Vista may ask for permission to continue.
Click on the “Sharing” tab and select “Allow other network users to connect through this computer’s internet connection” and click OK.
And this sets up your portable hotspot in Vista.
To use it, first connect to the Internet wirelessly using the usual method on your laptop. Then once you’re connected, go to Start -> Connect To and click your new network name under Wireless Network Connection. If all goes well, Vista will report “The [network] is ready to use” and inform you that the network is broadcasting and will stay active until everyone disconnects from it.
Your friends and colleagues should now be able to go to their Network Sharing Center and find your new network listed under Connect to a Network.
Note that only one internet connection can be set up for sharing at one time. If you later decide to enable it for your Ethernet connection, you’ll need to go into Network Connections and Properties for your “Local Area Connection.”
At this point, Vista is ready to share the default internet connection. This is probably the Ethernet connection, but we want to share the wireless card connection instead. On my Vista laptop, the wireless connection is called “National Access – Broadband Access.”
Again, go to Start -> Control Panel -> Network Sharing Center, and then click on “Manage network connections.” Right-click your wireless device and select “Properties.” Vista may ask for permission to continue.
Click on the “Sharing” tab and select “Allow other network users to connect through this computer’s internet connection” and click OK.
And this sets up your portable hotspot in Vista.
To use it, first connect to the Internet wirelessly using the usual method on your laptop. Then once you’re connected, go to Start -> Connect To and click your new network name under Wireless Network Connection. If all goes well, Vista will report “The [network] is ready to use” and inform you that the network is broadcasting and will stay active until everyone disconnects from it.
Your friends and colleagues should now be able to go to their Network Sharing Center and find your new network listed under Connect to a Network.
Note that only one internet connection can be set up for sharing at one time. If you later decide to enable it for your Ethernet connection, you’ll need to go into Network Connections and Properties for your “Local Area Connection.”
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Fuente: Bbrighthub
Por cierto, la información para llegar aquí fue desde: foroiphone, así que, gracias desde aquí al usuario
schumy 
por la información.
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