A Hackathon is a gathering of programmers, software developers, graphic designers, interface designers and project managers to collaboratively code in an extreme manner over a short period of time. Also known as a hack day, hackfest or codefest, the events could have a specific focus, which can include the programming language used, the operating system, an application, an API, or the subject and the demographic group of the programmers.

Computer hacking is the practice of identifying gaps in computer hardware and software and using it extract, modify, or delete someone's data for personal or professionals gains, that are different from the owner's original purpose. People who engage in such activities are called Hackers.

HACMP is an IBM cluster system for AIX-based computing platforms. All popular applications work with HACMP including DB2, Oracle, SAP, WebSphere, and others.

A free, Java-based programming framework that supports the processing of large data sets in a distributed computing environment. It is part of the Apache project sponsored by the Apache Software Foundation.

A software management program that caters to salon businesses.  It keeps track of inventory, employees, clients, and appointments.

Half-duplex data transmission means that data can be transmitted in both directions on a signal carrier, but not at the same time. 

Haml (HTML Abstraction Markup Language) is a lightweight markup language that is used to describe the XHTML of any web document without the use of traditional inline coding. It is designed to address many of the flaws in traditional templating engines, as well as making markup as elegant as it can be. Haml functions as a replacement for inline page templating systems such as PHP, RHTML, and ASP.

A computer that can conveniently be stored in a pocket (of sufficient size) and used while you're holding it. 

A language that allows the text portions of Web pages to be presented on cellular telephones and personal digital assistants (PDA) via wireless access. 

A typedef supplied in the Windows headers files. A typedef can be thought of as an alias or pseudonym. In the Windows registry, a handle represents an open instance of a basic operating system object with which applications interact. 

A full-featured portable computer that is slightly larger than a PDA, but much smaller than a laptop. It offers hardware, software, performance, and display capabilities.

Haptics is a tactile feedback that applies touch (tactile) sensation and control to interaction with computer applications. Haptic sensations are created in consumer devices by actuators, or motors, which create a vibration.  Those vibrations are managed and controlled by embedded software, and integrated into device user interfaces and applications via the embedded control software APIs.

The mechanism that controls the positioning, reading, and writing of the hard disk, which furnishes the largest amount of data storage for the PC. It is often shortened as 'hard drive'.

A hard drive overwriter is a program or utility that repeatedly overwrites the data on a computer's hard drive with gibberish. By overwriting the entire hard drive with gibberish, the user ensures that their information remains inaccessible.

A mechanical device that physically destroys old hard drives in such a way that the data they contain cannot be recovered. At a minimum, this involves severing every track on every platter in a drive.

A technology that encrypts the data stored on a hard drive using sophisticated mathematical functions. Data on an encrypted hard drive cannot be read by anyone who does not have access to the appropriate key or password.