Product keys are usually in the form of a line of alphanumeric characters. These is included with most types of software products that you purchase. When buying a software and installing it, you are usually prompted to enter your product key. This may take place after opening the program or even before installing it. The product key help to ensure that the software you bought is proper and registered legally. They also help to stop illegal software distribution to those who did not buy the software. Microsoft Operating Systems all Read More

Video applications often require you to manage several different signal sources. A video multiplexer is a device that helps you put recordings of signals from multiple security cameras on one cassette. It handles several video signals simultaneously. Video multiplexers can split a monitor into various display areas and vice versa, i.e., combine output signals from several cameras to a single monitor. You can then record your combined signal on your VCR or wherever else you want to record. They can also provide simultaneous display and playback features. Some video multiplexers Read More

Domain Controllers Security Issues When it comes to Windows Server 2003 Active Directory networks, one of the most important server roles which can be configured is probably the domain controllers role. Domain controllers perform a number of important functions and control activities within a domain, including the following: Contain a replica of the Active Directory directory for the domain to which it belongs, and is responsible for managing that directory Provide authentication services for the network. Store and distribute group policies. Manage access to network resources within the domain. Manage Read More

Yahoo Mail is a browser-based email client that Yahoo sponsors, which allows users to access their email, compose new messages, and organize messages into various categories such as “Inbox,” “Trash,” and “Spam.” Likewise, Yahoo Mail users are able to label messages, depending on who they are from and their content. Although many Yahoo Mail users have switched to other email clients over recent years, Yahoo Mail is still considered one of the most widely used browser-based email clients available.   What is an iPhone? An iPhone, which Apple created and Read More

Optical coherence tomography is the field of study in which light is used to see through a subject material’s surface. It is most often used in medicine in order to analyze a biological sample such as an eye, artery, or other body part. Although optical coherence tomography is a relatively new technique, it is considered much safer than other microscopy forms, it is cheaper to implement, and provides better results. How Optical Coherence Tomography Works Optical coherence tomography involves the use of a near-infrared light that is directed at a Read More

The longer a computer is used, the more cluttered the registry can become because most applications these days do not remove all traces of themselves when deleted. This can slow Windows’ performance. So it is essential to know how to clean the Windows registry to speed up the PC’s performance. Cleaning it up effectively is not easy, though. The steps for doing so are outlined below. The Windows registry is the Windows component that has all the information about the computer and the software installed on the computer. The Windows Read More

An IMEI, or International Mobile Equipment Identity, number is a number associated with a specific cell phone and can be used by authorities in a wide variety of countries to blacklist stolen cell phones, making them unusable to the thief, even if he/she replaces the phone’s SIM card. An IMEI number should not be confused with an IMSI, or International Mobile Subscriber Identity, number which is used to identify a subscriber. An IMEI is printed on the inside of the user’s cell phone and does not have any connection with Read More

Convert Miles to Kilometers Automatically To convert Miles to Kilometers, enter the number of Miles to be converted into the Miles box below. Miles: Millimeters (mm) Results: Micrometers (µm) 0 Millimeters (mm) 0 Centimeters (cm) 0 Meters (m) 0 Kilometers (km) 0 Inches (in) 0 Feet (ft) 0 Yards (yd) 0 Rods (rd) 0 Convert Miles to Kilometers Manually This chart allows users to convert Miles to Kilometers manually. For example, the chart below shows that 8 miles is equal to 12.875 kilometers. Miles Kilometers 1 1.609 2 3.219 3 Read More

An Overview on Certificate Authorities In the Public Key Infrastructure (PKI), digital certificates are based on public key cryptography. The PKI consists of a set of components, policies, protocols, and technologies that provide data authentication, integrity, and confidentiality through the use of certificates, and public and private keys. Data is protected by applying a hashing algorithm and signature algorithm to the original message. A hashing algorithm is an intricate mathematical algorithm which is applied to the message. The hashing algorithms which are commonly used are MD2, MD4, MD5, and SHA-1. Read More

Lossy compression is a type of compression that removes unnecessary components of a file to reduce the file’s size. Lossy compression is often used in multimedia files, such as still images and audio files that hold a significant amount of redundant information. Lossy compression results in a reduction of quality of the file that is being compressed, but the quality difference is usually not noticed by the human senses. Because of this, multimedia files can be significantly smaller when compressed by lossy compression.   Applications Lossy compression can be used Read More