Can't prevent theft
Locking up a laptop after it has been stolen doesn't really count as anti-theft, as it doesn't prevent the actual theft. It is just a minor revenge at the thief.
While you can argue that it is a slight deterrent, as a thief risks stealing something that is worth less than they expect (it is not totally worthless, as RAM, HD and other accessible parts can be taken out and sold separately), I doubt thieves will take time to check if the laptop they steal is protected -- especially if they just nick a laptop carrying case while the owner is busy buying tickets at the local train station.
The only effective theft prevention it to have the laptop locked onto something. Government officials carrying confidential material on their laptops should have them cuffed to their wrists.


