I happened to come across a Korean Blog today. It is a blog of an exchange student, which I quite enjoyed reading. Korea is a place that has fascinated me. Next to Vietnam, the people of Korea are the most hard working people on earth, and the Americans know that as they have taken over South Korea, and the North Korean area is communist. The life in South Korea is luxurious, while it is not so really in the north, as it is run by a dictator, and the punishments are quite severe if you let out a loose word against the dictator, and the whole of your family including your parents, spouse, kids, cousins, brothers, sisters, and their spouses and children, and any one at all in your family circle will be sent to jail. And the conditions at the jail are not quite good. People have to live on mice there.

Or so says Discovery Channel and National Geographic Channel. Well, we never know for sure. Journalists always give out their points of view, which need not be true. Everyone would have their own view, and TV channels would make programs in a way that would make them the most money from advertisments and give them a good viewership. If you want the facts, you should be reading an induvidual’s blog like this, and he will give you the real picture of Korea.

A KVM switch (with KVM being an abbreviation for Keyboard, Video or Visual Display Unit, Mouse) is a hardware device that allows a user to control multiple computers from a single keyboard, video monitor and mouse. Although multiple computers are connected to the KVM, typically a smaller number of computers can be controlled at any given time. Modern devices have also added the ability to share USB devices and speakers with multiple computers. Some KVM switches can also function in reverse – that is, a single PC can be connected to multiple monitors, keyboards, and mice. While not as common as the former, this configuration is useful when the operator wants to access a single computer from two or more (usually close) locations – for example, a public kiosk machine that also has a staff maintenance interface behind the counter, or a home office computer that doubles as a home theater PC.

A user connects a monitor, keyboard, and mouse to the KVM device, then uses special cables (generally USB and VGA ) to connect the KVM device to the computers. Control is switched from one computer to another by the use of a switch or buttons on the KVM device, with the KVM passing the signals between the computers and the keyboard, mouse and monitor depending on which computer is currently selected. Most electronic devices also allow control to be switched through keyboard commands (such as hitting a certain key, often Scroll Lock, rapidly two or three times).

Devices differ in the number of computers that can be connected, with anywhere from two up to 64 computers possible. Enterprise-grade devices can also be daisy-chained to allow even greater numbers of computers to be controlled from a single set of a keyboard, visual display unit and mouse.

A KVM switch is useful where there are multiple computers, but no need for a dedicated keyboard, monitor and mouse for each one. They are frequently used in data centers where multiple servers are placed in a single rack with a single keyboard, monitor and mouse. A KVM switch then allows data center personnel to connect to any server in the rack. A common example of home use is to enable the use of the full-size keyboard, mouse and monitor of the home PC with a portable device such as a laptop, tablet PC or PDA.