Short for personal digital assistant, a handheld device that combines computing, telephone/fax, Internet and networking features. A typical PDA can function as a cellular phone, fax sender, Web browser and personal organizer. PDAs may also be referred to as a palmtop, hand-held computer or pocket computer.
Not a Portable Computer
Unlike portable computers, most PDAs began as pen-based, using a stylus rather than a keyboard for input. This means that they also incorporated handwriting recognition features. Some PDAs can also react to voice input by using voice recognition technologies. PDAs are available in either a stylus or keyboard version.
Apple Computer, which introduced the Newton MessagePad in 1993, was one of the first companies to offer PDAs. Shortly thereafter, several other manufacturers offered similar products. One of the most popular brands of PDAs was the series of Palm Pilots from Palm, Inc.
Smartphones and Tablets Render PDAs Obsolete
As technology changed the world of mobile devices, the PDA has become obsolete as devices like touch-screen smartphones and tablets grow in popularity. Many of the original manufacturers of PDAs eventually entered the smartphone and tablet market, or were bought out by larger companies. For example, Palm was purchased by HP and the operating system used in a line of early HP TouchPads.
Short for Primary Domain Controller, a server in a Windows NT network that maintains a read-write directory of user accounts and security information. The PDC authenticates usernames and passwords when members log into the network. Members only have to log into one domain to access all resources in the network. In a trusted relationship, one […]
- Portable Document Format (PDF)
PDF is short for Portable Document Format. PDF is a file format developed by Adobe Systems in 1992. PDF captures formatting information from a variety of desktop publishing applications, making it possible to send formatted documents and have them appear on the recipient’s monitor or printer as they were intended.This is because a PDF will […]
(1) Short for Protocol Data Unit. The term used to describe data as it moves from one layer of the OSI model to another. In this reference, PDU is often used synonymously with packet. (2) Short for Power Distribution Unit. An electrical device used to control the distribution of power to individual loads. The PDU […]
Pronounced “peep” and short for Protected Extensible Authentication Protocol, a protocol developed jointly by Microsoft, RSA Security and Cisco for transmitting authentication data, including passwords, over 802.11 wireless networks. PEAP authenticates wireless LAN clients using only server-side digital certificates by creating an encrypted SSL/TLS tunnel between the client and the authentication server. The tunnel then […]
Short for PHP Extension and Application Repository, PEAR is a framework and distribution system for reusable PHP components. PEAR is a community-driven project with the PEAR Group as the governing body. The project was founded by Stig S. Bakken in 1999. The code in PEAR is partitioned in packages, where each package is a separate […]