The program allows users to display alerts on the missing computer's screen and even to set a spoken message. Tracking software for stolen laptops has been on the market for some time，

　　but this is thought to be the first that allows owners to_give_the_thief_a_piece_of_their_mind.

　　Owners must report their laptop missing by visiting a website，

　　which sends a message to the model： a red and yellow “lost or stolen” sign appears on its screen when it is started. Under the latest version(版本)of the software，

　　users can also send a spoken message.

　　The message can be set to reappear every 30 seconds，

　　no matter how many times the thief closes it. “One customer sent a message saying，

　　‘ You are being tracked. I am right at your door. ’” said Carrie Hafeman，

　　chief executive of the company which produces the program，

　　Retriever.

　　In the latest version，

　　people can add a spoken message. For example，

　　the laptop's speaker will say “Help，

　　this laptop is reported lost or stolen. If you are not my owner，

　　report me now.”

　　The Retriever software package，

　　which costs $29. 95 but has a free trial period，

　　has the functions of many security software programs. Owners can remotely switch to an alternative password if they fear that the thief has also got hold of the access details.

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