Preventing other Bluetooth devices from accessing your PC
To prevent other Bluetooth devices accessing your PC through the Public Folder created by your Bluetooth installation:
1. Next to the clock in the lower right-hand corner of your desktop, double-click on theBluetooth Configuration icon to open the My Bluetooth Places window – 
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2. In the menu on the top of the window, click on Bluetooth > Advanced Configuration (or Bluetooth Configuration). The Bluetooth Configuration dialog appears.
- Click on the Accessibility tab. In the Allow section select Only devices listed below. Then press theAdd Device button and select your NOAHlink.
- As added security you can uncheck Let other BlueTooth devices discover this computer. Then click OK.