Wireless systems have evolved to successfully penetrate the world of personal communications, where virtually all people can talk as needed on-demand with a feature rich and flexible set of alternatives. This world of people talking is now being complemented with a wireless world of all things “talking” – in other words, all things are becoming wireless. As these new systems continue to evolve to meet their best-fit applications in the enterprise, matching each one’s unique characteristics to the application is not always clear to the prospective end user or even to a providing system integrator.
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Google Earth is a virtual globe program, allowing viewers to visualize data on top of displayed satellite images of the Earth’s surface. Launched in 2005 and released to the public in 2006, Google Earth fast became a household name hailed as a revolution for humanitarian development, much as Geographic Information Systems (GIS) were several decades ago. According to MapAction, “There seem at present tobe two distinct groups of humanitarian practitioners: those who are already, albeit tentatively,exploiting Google Earth and related geospatial methods in their work,and those whowill be, as soon as they see their first demonstration of its potential.” (MapAction, 2008: 9)
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Google Desktop is a free downloadable application that offers an easy way to search for information on your computer, across your personal computer network and from the web. It includes full text search over your primary computer’s email, files, music, photos, chats and web pages you’ve viewed. By making your computer searchable, Desktop puts your information easily within your reach and frees you from having to manually organize it. Searching your computer is now as easy as searching the web with Google.
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Modern Geographical Information Systems (GIS) [1] provide a service-oriented architecture for interacting with geographical data sets and related maps. Web-based GIS systems are architected around the same principles as more general Web service systems based on SOAP [2], WSDL [3], and REST. Mirroring the World Wide Web Consortium and OASIS Web service standards-making bodies, the Open Geospatial Consortium [5] defines open standards for messages, XML data formats, and access protocols that are specific to the GIS community. In addition to OGC-based services, there are many companies (such as ESRI and AutoDesk) that provide proprietary, commercial solutions. Services from these various providers are not normally interoperable.
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The TL-WA501G 54Mbps Wireless Access Point is the basic building block of a wireless LAN infrastructure. It provides connectivity between Ethernet wired networks and radio-equipped wireless notebook systems, desktop systems, print servers, and other devices.

The TL-WA501G 54Mbps Wireless Access Point acts as a bridge between the wired LAN and wireless clients. Connecting multiple TL-WA501G Access Points via a wired Ethernet backbone can further lengthen the wireless network coverage. As a mobile computing device moves out of the range of one access point, it moves into the range of another. As a result, wireless clients can freely roam from one Access Point to another and still maintain seamless connection to the network.
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In this software product, students and teachers can access the installed Comprehension Expedition™ program with a username and password unique to each user. Teachers can set up their classes, make assignments, and view reports. Students can access their assignments and review their progress or freely explore all skills. This system provides a management tool for teachers and a content portal for students. After logging in, the program will look very different to each of these two types of users.
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System security is important! If you ask the question, “Who would want to break into this system or why would they want to?,” the how and why of this line of questioning could fill volumes. The “who” could be anyone whether they have legitimate access or not. The “why” is simple: free computing resources, access to data, damaging your system, embarrsing the university. A compromised system can quickly become a liability as it can affect the network or operations on other machines both locally and remotely.
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Over the course of this book, it will be my job to guide you as you take your first steps beyond the HTML world of client-side site design. Together, we’ll explore what it takes to develop the kind of large, content-driven sites that are so successful today, but which can be a real headache to maintain if they aren’t built right. Before we get started, you need to gather together the tools you’ll need for the job. In this first chapter, I’ll guide you as you download and set up the two software packages you’ll need: PHP and MySQL.
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