IOGear GWU623 manual Utility Configuration Disable / Enable Wi-Fi, Windows XP
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Utility Configuration - Disable / Enable Wi-Fi
Windows XP
1.If you would like to disable a Wi-Fi connection temporary, you may do so by right clicking on the Atheros icon in the system tray and selecting Disable Radio.
2.You may re-establish the Wi-Fi connection at anytime by selecting Enable Radio