How to Connect Your Laptop to an Unknown SSID in Windows XP
For security reasons, some wireless networks don’t broadcast their SSIDs. A wireless network not broadcasting its SSID doesn’t show up in your list of networks.
You first need to ask for the SSID from the person in charge of the network. After you know the SSID, you must manually connect. Follow these steps to do so:
Choose Control Panel from the Start menu.
The Control Panel window appears.
Click the Network Connections icon.
The Network Connections window appears.
Right-click the wireless network connection's icon and choose Properties from the pop-up menu.
Click the Wireless Networks tab.
Click the Add button, near the bottom of the dialog box.
In the Wireless Network Properties dialog box that appears, you can manually configure the connection to the unknown wireless network.
Type the SSID in the Network name field.
Optionally, enter the network key or password.
If the network key box is disabled, as shown in the above figure, another dialog box may appear and prompt you to enter the password.
At this point, the network should show up as available in the list. You can then connect to it by clicking its name.