When a company or organization wants to use the Internet, they must decide whether they want to do it by directly attaching to the Internet system or whether they will use another company to supply the connection. Many companies choose to use another company, called a service provider, because it reduces the amount of equipment, administration, and costs involved. If the company or organization wants to directly connect (and sometimes when they are using a service provider), t....

You will create two main types of variables in your PHP code: scalar and array. Scalar variables contain only one value at a time, and arrays contain a list of values, or even another array.The example at the beginning of this chapter created a scalar variable, and the code in this book deals primarily with scalar variables. You can find information on arrays in Appendix B, "Basic PHP Language Reference." When you assign a value to a variable, you usually assign a va....

Establishing a Linux TCP/IP network requires two components of hardware: the network interface card (NIC) and the network medium. As with most things in life, you can opt to go for an inexpensive card and medium or spend lots more money for full-featured items. As the amount you spend increases, you get more functionality and benefits, although usually with diminishing returns for your dollar. Before deciding on the type of network interface cards to use (unless you already ha....

When we think of Trojans, we normally think of the huge wooden horse that the Greeks gifted the city of Troy, in which they had secretly hidden a small number of their warriors. When the Trojans took the horse into the city the soldiers emerged and opened the gates to the cities enemies. Computer trojans are based on the same idea; what can appear to be useful program or harmless site can be hiding a small Trojan program that once it has infected your computer opens a secret b....

Search engines can help you find specific information on the Internet, but they also flood you with large amounts of irrelevant information. With a little bit of extra effort on your part, though, you can make sure that a search engine finds exactly what you want, as quickly as possible. The next time you use a search engine, try some of the following tips.

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