Linux was developed as a freely distributable version of UNIX. UNIX is the most widely used operating system in the world and has long been the standard for high-performance workstations and larger servers. UNIX, first developed in 1969, has a strong programmer-oriented user group that supports the operating system.How did UNIX get its name? It was based on an operating systems called MULTICS (MULTiplexed Information and Computing System). Ken Thompson, Dennis Ritchie, and Bri....

We saw at the beginning of this section that one way to embed client-side JavaScript into HTML documents is to use event handler attributes of HTML tags. The following table lists the standard event handler attributes and the HTML tags to which they may be applied. The first column of the table gives the event handler attribute name: these names always begin with "on". The second column of the table lists the HTML tags to which these attributes can be applied, and ex....

The rest of this book contains a quick-reference for the core and client-side JavaScript APIs. It documents the complete core JavaScript API, covers the legacy (Level 0) DOM API, and presents a simplified view of the W3C Level 2 DOM API. Portions of that API not relevant to JavaScript programmers working with HTML documents have been omitted. The upper-right corner of the title block for each reference entry contains information that states whether a feature is part of the cor....

In 2001, Safeware(http://www.safeware.com) estimated that thieves stole over 500,000 laptops for that year but only 15,000 desktop computers. Laptops make the most obvious and enticing targets because of their small size, light weight, and high resale value, so if you’re traveling with a laptop in public, do your best to hide it. Walk through any airport and you’ll see many people carrying their laptops in distinctive black carrying cases, easily....

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....