VUWER is a background process that automatically starts running after login to a user account on your laptop computer. VUWER periodically monitors a web page, remote computer account, or Dropbox account that you create. By altering a line of text on the web page, or a text file on the remote account or in Dropbox, you can instruct VUWER to automatically capture screen shots, camera images, and the IP address (with associated geolocation information) that your laptop is using to connect to the Internet, and send that information to you at regular intervals.
VUWER operates independently of Apple's iCloud 'Find My Mac' service, and provides information and capabilities that 'Find My Mac' does not. 'Find My Mac' only shows the approximate location on a map.
In an urban setting (e.g. an apartment building in a city), it may be impossible to determine exactly who has your laptop using 'Find My Mac' alone. And while 'Find My Mac' gives you the ability to remotely lock or erase your laptop, doing so may actually reduce your chances of getting the laptop back.
The philosophy behind VUWER is different: by allowing the thief to use your computer, you can discreetly gather information about him, including his photograph, his name, his home address, the network(s) he uses, and the web sites he visits. With this information, your chances of recovering your laptop (and having the police arrest the thief) are greatly improved.