With the new technologies in modern day, sharing internet connection from one computer or device (cellphone) is very fast and flexible. For example, Iphone, Android or 3G USB can share their network to others easily. In this post, I do not mention about Cellphone devices, I will discuss about Computer sharing network.
Windows 7
You can create an ad-hoc network or download
Connectify software into your machine. In my case, I am using Google Nexus One (rooted) with 3G network. My Laptop connect to my mobile network then share to the others through Connectify. Just follow the
Easy Setup Wizard to configure.
If you are using another different OS (XP, Linux, Mac) without supporting of Connectify, you can create ad-hoc network for sharing (just google it) or using RJ45 cable.
There is another option which I am using on my desktop. I am using a Desktop in my house and I want every times it turn on, It will automatically open the WiFi sharing for my house. I can buy a WiFi modem or another WiFi usb. They both work well. My recommendation is a Ralink USB WiFi with Ralink ultility to turn Usb into Access Point.
Have fun!