This is a Locale Plug-in. For it to work you will have to have Locale or Tasker already installed on your device. How you use it: 1. Select the plugin in Locale. 2. Scan a NFC-enabled tag of some kind. 3. Chose actions that should fire when tag is scanned. Your screen will have to be on for the phone to be able to scan NFC-tags.
Get the free setup package of Locale NFC Plugin 1.0.3 and have a look at users' reviews on Droid Informer. The app runs on Android devices 2.3 and higher. This application is totally secure for downloading. Bad Access Development is the creator of the tool that can be found in the Productivity category.