No, if all you want to do is share information among the devices in your home network and do not need an internet connection then it isn't necessary.
No, a simple home network can be configured to share data and devices without connecting to the internet.
Internet Connection.
Yes. You do not need an Internet connection to create a network.
internet connection
The Playstation Home is part of the Playstation network and if you have a PS3 with a internet connection it is available to you
Hardwired ADVANTAGES: Faster Internet connection, especially downloading data. Faster printingDISADVANTAGES: Bound to one place; non portableWireless ADVANTAGES: Decent internet connectionPortable throughout home network coverageDISADVANTAGES: Slower network printing WiFi ADVANTAGES: 100% Portablility Anywhere in the world, not bound to a home network. Decent Internet ConnectionDISADVANTAGES: Dead-Spots Not as fast as having a home network
You must have a wireless network connection. If you failed at connecting, maybe it has a password.
This link should help you set up an internet connection through another computer on the home network and fix this problem. http://support.microsoft.com/kb/306126/
In order to set up a home wireless internet connection, you must have broadband service and a wireless router. After connecting your router, use your computer and the router's instructions to set up your network.
Virtual private networks are a technology that simulates a LAN network using the public internet rather than privately owned wiring. For example, you can use your home internet connection to VPN to your work network and be securely part of that network.
Use the network connection utility to test connectivity, then connect to a known working internet address across the network.
The iPad requires a wireless network that it can join. At home this would be your own Internet provider connection via a wireless router.