(by Adam Collett
http://www.thedarkisrising.co.uk/adjman/index.shtml)
You will require a portable Apple Macintosh computer, with an Apple AirPort card installed and Mac OS X 10.2 or higher.
1 - Open the System Prefrences

2 - Click on the Network Icon

3 - Drop down the Show menu and choose Airport

4 - On the TCP/IP panel, choose Configure: Using DHCP

5 - On the Appletalk panel, UN-tick Make Active

6 - On the Proxies panel, UN-tick all proxy options

7 - On the AirPort panel, Choose “Join a Specific Network” and type piertopier.net in the Network box, also UN-tick the “Allow this computer to create networks” but leave “Show AirPort status in Menu Bar ticked.

8 - Click on Apply Now

9 - Quit the System Preferences (Apple Key + Q)
10 - Open a web browser, such as Safari

11 - You should be presented with a logon box, simply click Login (or OK, no password required)
12 - You will need to Login again after 1 hour of use.