Different from other security software, Retriever can ______.

参考解析：

细节理解题。根据第二段第二句“Tracking software for stolen laptops has been on the market for some time”可知，追踪被偷的电脑已经上市很久，说明很多软件都使用，所以A项错误；根据倒数第四段的内容“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.”可知，很多安全软件都具备远程锁定电脑的功能，所以C项错误。根据第二段第一句“The program allows users to display alerts on the missing computer’s screen and even to set a spoken message.”和第三段最后一句“Under the latest version(版本) of the software, users can also send a spoken message.”可知，不同于其他安全软件，Retriever允许用户在丢失的电脑中装置警报，甚至发送语音信息，所以D项正确。B项未提及。故选D。