Multihome - A multihome, or load balanced, network means distributing processing and communications activity evenly across a computer network so that no single device is overwhelmed. Load balancing is especially important for networks where it's difficult to predict the number of requests that will be issued to a server. Busy websites typically employ two or more web servers in a load balancing scheme. If one server starts to get swamped, requests are forwarded to another server with more capacity.

NCSA - NCSA stands for the National Center for Supercomputing Applications. The NCSA developed several imporant web protocols and software systems, including the standard logging type used by Apache -- NCSA Extended Combined.

Navigation - Describes the movement of a user through a website or other application interface. This term also indicates the system of available links and buttons that the user can use to navigate through the website.

Network - A set of computers connected so that they can communicate and share information. Most major networks are connected to the global network-of-networks, called the Internet.

No Referral - The "(no referral)" entry appears in various Referrals reports in the cases when the visitor to the site got there by typing the URL directly into the browser window or using a bookmark/favorite. In other words, the visitor did not click on a link to get to the site, so there was no referral, technically speaking.

OS - (Operating System) Software designed to control the hardware of a specific data-processing system in order to allow users and application programs to employ it easily. (MacOS, Windows 95)

Online - A general term referring to anything connected to or conveyed through a communication network.

Organization - The classification to which a Domain Name belongs. Typical Suffixes are: .com = Commercial, .org = Organization, .edu = Educational, .int = International, .gov = Government, .mil = Military, .net = Network

Opt-in/opt-out - Opt-In is the action a person takes when he or she actively agrees, by email or other means, to receive communications. It requires tactics and mechanisms to encourage and allow people to become recipients. Opt-Out is the action a person takes when he or she chooses not to receive communications. It requires tactics and mechanisms by which people can ask to be removed reliably from an email list.

PDF - Portable Document Format is a file format developed by Adobe Systems to allow for display and printing of formatted documents across platforms and systems. PDF files can be read on any system equipped with the Acrobat Reader software, regardless of whether or not your computer has the software that the document was created in.

PMML (Predictive Modeling Markup Language) - An effort by the Data Mining Group (DMG) to make predictive models interchangeable. PMML is based on XML. It supports a number of different statistical predictive model types.

Page - Also known as a web page, a page is defined as a single file delivered by a web server that contains HTML or similar content. Any file that is not specifically a GIF, JPEG, PING, JS (javascript), or CSS (style sheet) is considered a page.