To change a Microsoft Exchange password, follow these instructions: Press the [CTRL], [ALT], and [DELETE] keys at the same time. In the window that pops up, click the Change Password button Enter a User name Select the domain that the password is being changed for Enter the old password Enter the new password Enter the new password again Click the OK button A box that says “Your password has been changed” will pop up. Changing the Microsoft Exchange password will only change the password in the mail server. It will Read More

A retrograde orbit is an orbit where the satellite travels in an East to West direction instead of the common West to East orbit. The normal West to East orbits are known as prograde orbits. Retrograde orbits are uncommon due to the much higher velocities necessary for successful launch and the associated higher costs. During a prograde launch, rotational velocity of the Earth is added to the velocity of the launch rocket. In a retrograde launch, the rotational velocity of the Earth is subtracted from the velocity of the launch Read More

An Ethernet or network isolator is a type of galvanic isolator used in copper-based Ethernet systems. It protects devices and users from possible differences in ground potentials of the voltages in two or more different circuits or circuit components. Ethernet isolators depend on electromagnetic induction to bridge a physical isolation gap within Ethernet systems and do not require any external power supply other than the energy being transferred across the Ethernet cable itself. How Ethernet Isolators Work An Ethernet isolator separates the electrical currents of multiple devices, circuits, or circuit Read More

With so many people using cell phones these days, one of the devices that have popped- up on the market are cell phone jammers. Be advised that cell phone jammers are usually black market devices, since using them is illegal in most municipalities. However, for those that are tired of hearing endless cell phone conversations or constantly being interrupted by incessant cell phone ring tones, a cell phone jammer seems like the perfect device to own. How Cell Phone Jammers Work Cell phone jammers work in a similar way to Read More

An organizational unit (OU) is a container that logically organizes and groups Active Directory objects within domains. OUs are not part of the DNS namespace. They organize Active Directory objects into logical administrative groups. OUs therefore serve as containers in which users can create and manage Active Directory objects. OUs are considered the smallest unit to which an Administrator can assign permissions to resources within Active Directory. An OU enables users to apply security policies, deploy applications, delegate administrative control for Active Directory objects, and run scripts. An important thing Read More

Radio was not invented by any single person, but instead was a culmination of several scientists’ research, each of whom pioneered a different area of electromagnetic radiation and radio waves during the late 1800s and early 1900s. Among these men are well known researchers such as Heinrich Rudolf Hertz, James Clerk Maxwell, David E. Hughes, Thomas Edison, and Nikola Tesla. The Role of James Clerk Maxwell In order to fully understand the invention of radio, we must go back to an earlier point in time when electromagnetism was first discovered. Read More

Anthracite coal is a form of coal that is almost made entirely of carbon. Anthracite coal is much harder than other forms of coal such as bituminous, and is usually found in areas surrounding mountains or deep valleys. Anthracite burns much cleaner than other forms of coal due to its low pollutant content. In fact, anthracite may contain 91% to 98% pure carbon, leaving only 2% to 9% of other elements. Anthracite coal is difficult to ignite and burns with a blue, smokeless flame. Where does Anthracite Coal Come from? Read More

An integrated circuit (IC), also called a microchip, is an electronic circuit etched onto a silicon chip. Their main advantages are low cost, low power, high performance, and very small size. History The integrated circuit was invented in 1958 by Jack Kirby (1923-2005), an American engineer. In 2000, he won the Nobel prize in physics for his integrated circuit. This basic design has evolved over the last half century to reach the level of the modern computer chip, which has millions of transistors on a thumbnail size piece of silicon. Read More

What is Google Earth? Google Earth is a compact program that Google created and provides for free. It allows users to visit nearly any location on the planet in a virtual environment. Google Earth is similar to Google Maps but has much more functionality and can be downloaded to the user's computer. By using multiple geosynchronous satellites combined with GPS monitoring systems and the Google Search Engine, Google Earth is able to locate and show the user a recent image of any location. For example, Google Earth can be used Read More

While there is not single specific value to determine the maximum length of a URL, users should be aware that variances in standards can cause different results. HTML3 imposes a 1024-character limit to attribute values, while HTML4 has no such restriction. There is no set minimum or maximum URL length, but some applications do have length restrictions; Internet Explorer imposes a 2084-character limit. Other variances in maximum URL length can occur inside web servers themselves as they may have an internal query-string limit. When this internal query-string limit is broken, Read More