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S2U2 is a simple lock/unlock application which has the iPhone style slide unlocking. It can be used as a screensaver while you don't use your device. And it's has a CallerID function.

www.freewarepocketpc.net/ppc-download-s2u2.html - Preview

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USB PC Lock Pro
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USB PC Lock Pro Turns any USB Flash Drive into a key that prevents unauthorized people from using your computer. USB PC Lock will automatically lock your computer and perform other actions when you step away from it.
Key Features:

Lock worksation when you step away.
Lock MSN Messenger.
Stop streaming media traffic.
Mute audio.
Start/Stop event logger.
Start/Stop batch.

www.speedapps.com/usbpclock.htm - Preview

software freeware usb flashdrive lock