Printer calibration helps the printer to replicate a more accurate copy of what is seen on a computer screen. Printer calibration is needed to ensure that the printed image comes out as colorful and vibrant as it was on the monitor. Without printer calibration, the printed images’ colors could easily come out faded, dull, or incorrect. The monitor that is being used to view the pre-printed image should also be adjusted to ensure the most accurate print-out possible. The printed colors may be incorrect for several different reasons: Color Reproduction Read More

A prepaid cell phone is one that allows users to pay in advance for their service without the commitment and penalties of a long term contract. While contract plans are still the most popular form of mobile phone service, prepaid cell phones have become very popular in recent years and have grown in use amidst rising contract prices. Most cell phone companies now provide prepaid cell phones and prepaid cell phones are even available in many convenience stores and gas stations. How It Works Prepaid cell phones are actually rather Read More

Windows users may encounter the following when trying to start the HP Solution Center: “The installation package for solution center cannot be found. Try the installation again by using a valid SolutionCenter.msi.” This error commonly occurs when the solution center software was installed from a downloaded file and is then unavailable to reinstall the HP Solution Center if required. It can also be triggered through Windows Operating System (OS) updates that are no longer fully compatible with the version of the HP software on the computer. At minimum, users may Read More

“cannot resolve symbol” means that the Java compiler cannot locate a symbol referenced in your Java source code. The causes for this common error include: A missing class file A faulty CLASSPATH A symbol name is mispelled or miscapitalized A data type is incorrect, misspelled, or miscapitalized A method is called with the wrong number or types of arguments An undeclared variable cannot resolve symbol errors can be very difficult to track down. Code carefully!

A Trivial File Transfer Protocol (TFTP) server is based on a simple Fire Transfer Protocol (FTP) that was first defined in 1980. TFTP books routers and other computers that do not have storage devices. It also transfers small files between two or more computer network hosts such as a transfer initiated on a remote X Window System terminal. TFTP servers are also based on the traditional EFTP protocol that was part of the PUP protocol tool suite and is normally one of the first protocols used on a new host Read More

Skype is an instant messaging software that the international community uses because of its vast collection of features and interactive social networking options. Although Skype was first introduced as a basic instant messaging software, it has included audio and video conversations to its tool set over recent years. Additionally, each user has a unique profile and can modify text via font options and emoticons while conducting audio and video conversations with the aid of a microphone and/or webcam.   What is Skype Video? Skype Video is a Skype feature that Read More

Common threats to DNS servers include: Denial-of-service (DoS) attacks: DoS attacks occur when DNS servers are flooded with recursive queries in an attempt to prevent the DNS server from servicing legitimate client requests for name resolution. A successful DoS attack can result in the unavailability of DNS services, and in the eventual shut down of the network. Footprinting: Footprinting occurs when an intruder intercepts DNS zone information. When the intruder has this information, the intruder is able to discover DNS domain names, computer names, and IP addresses which are being Read More

The application layer of a software is a protocol that is used for communication between a software and the network layers that it uses. The application layer allows a computer’s network to interpret requests made by the program and allows the program to interpret data from the network. Likewise, the application layer ensures that both parties are available and can communicate with another, authenticates messages from both parties, and ensures that both parties agree about privacy, data integrity, and error recovery.   How An Application Layer Works The application layer Read More

Degaussing is a process of reducing the magnetism of a material by applying an opposite magnetic field. The name is derived from a unit of magnetic flux, the gauss. There are many different uses for degaussing. Cathode Ray Tubes Most televisions and computer monitors that use cathode ray tubes have a degaussing function. The electron beams cause a magnetic field to build up on the shadow mask, and this changes the path of the beams causing the picture to warp. An insulated bundle containing many turns of copper wire is Read More

A quantum dot is a semiconductor that exhibits tremendous capability despite the fact that they are so tiny: 2-10 nanometers. Because materials behave much differently when they are at this size, researchers hope that they will be able to make tremendous steps in many different applications of science and technology. Because of the size of them, the quantum dots provide the researcher with the ability to tune the dots to levels that have never been reached before. To describe it in a much more straight forward manner, a quantum dot Read More