Wireless laptop adapter cards are necessary for mobile workers to take advantage of hot spots and Wi-Fi Internet access in hotels, airports and train stations. Working on the road is much easier when you can connect to the Internet or company network using a wireless laptop adapter.
Linksys WPC54G Wireless-G Notebook Adapter...is just one example....Although my son has a laptop that has a built in card and sometimes he still can't connect if he isn't in a hot spot or someone has their connection blocked.