不具有情境感知能力的PDA(个人数字助理),也许能够借助无线网络的服务与应用程序,达到在任何时间、任何地点,提供任何使用者需要的任何信息,但是我们更着重在合适的时间,以合适的方式,提供使用者合适的信息。在文中,我们提出一个具有情境感知能力的PDA软件和硬件平台,包含了一个全球定位系统(GPS)传感器和相关的应用程序,使这台PDA能够在合适的状况下,给使用者提出适当的提示讯息。 PDA (Personal Digital Assistant), without contextual awareness, may be able to use the services and applications of the wireless network to provide any information that any user needs at any time, anywhere, but we are more focused on the right time, In a suitable way, provide the user with suitable information. In this article, we propose a context-aware PDA software and hardware platform that includes a Global Positioning System (GPS) sensor and associated applications that allow the PDA to make appropriate, user-friendly Prompt message.