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 core or client-side API, and further indicates which version of JavaScript, which browsers, or which version of the DOM introduced the feature.

Datacenter Edition builds on the feature set offered by Enterprise Edition and eliminates a few features that aren’t considered appropriate for a large enterprise data center. For example, Datacenter does not support the Internet Connection Firewall or Internet Connection Sharing, two features designed to make Windows an Internet gateway for network clients. Both features are, however, supported by Standard Edition and Enterprise Edition. Datacenter Edition adds support for up to 64GB of server RAM and up to 32-way processor support. These features require a specialized Hardware Abstraction Layer (HAL), which is provided by the server hardware manufacturer. Datacenter Edition’s Cluster Service supports eight-way clusters, enabling you to build more complex failover clusters for mission-critical applications.

Computer viruses can be classified into several different types. The first and most common type is the virus which infects any application program. On IBM PC’s and clones running under PC-DOS or MS-DOS, most programs and data which do not belong to the operating system itself are stored as files. Each file has a file name eight characters long, and an extent which is three characters long. A typical file might be called “TRUE.TXT”, where “TRUE” is the name and “TXT” is the extent. The extent normally gives some information about the nature of a file—in this case “TRUE.TXT” might be a text file. Programs must always have an extent of “COM”, “EXE”, or “SYS”. Under DOS, only files with these extents can be executed by the central processing unit. If the user tries to execute any other type of file, DOS will generate an error and reject the attempt to execute the file.

The type of cabling used in a network is called the network medium. Today, networks use many types of cables, although only a few types are in common usage. Some of the more exotic types of cables are very expensive. The type of cabling can have an influence on the speed of the network, although for most small- to medium-sized local area networks this is not a major issue. Twisted pair cabling is one of the most commonly used network mediums because it is cheap and easy to work with. Unshielded twisted pair cables—often called UTP—look just like the cable that attaches your household telephone to the wall jack. Twisted pair cables have, as its name suggests, a pair of wires twisted around each other to reduce interference. There can be two, four, or even more sets of twisted pairs in a network cable.