The thieves were voracious, filching flat-screen televisions and computer games, purloining iPods and DVDs, even making off with a box of liquor and a set of car rims in a burglary two weeks ago at an apartment three young people shared here. Luckily, they also took two laptop computers.

One of the laptops was a Macintosh belonging to Kait Duplaga, who works at the Apple store in the Westchester mall and thus knows how to use all its bells and whistles. While the police were coming up dry, Ms. Duplaga exploited the latest software applications installed on her laptop to track down the culprits and even get their photographs.

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