Information technology and communications ministry of development

Operation keystrokes

The function keys are in a line along the top front of most keyboards.
A large number of computer programs use the F1 key as a universal help key. Likewise, pressing the ESC key will usually take you back to the previous step. Other function keys--F1 through F12--have typical functions, such as F8 saving a document. It is important to note that these functions are set by individual programs, and will vary from one application to the next.
Shortcut commands

Applications define a range of specific functions for the CTRL key.
Almost all programs allow basic keyboard commands. These commands include Ctrl+A to select and highlight all content, Ctrl+C to copy highlighted text, and Ctrl+V to paste text you have copied. You may be surprised to find out that more than half of your keys have functions associated with the CTRL key combination, and the help files of your software program will offer

What is Computer Mouse?

Definition – Mouse is a pointing input device of computer. Mouse help to control cursor that is visible on the computer screen while moving the mouse on flat surface place. Its name was originated by its shape that look as mouse, because it has elliptical shaped with mouse tail.
Mouse reduces usability of a keyboard.  Traditional mouse was connected with computer through cable or cord, but now these days in the market have to various mouse are available such as wireless mouse, those mice do not need any physical wire to make connection with computer. In technology time, some mouse has some extra buttons for performing other special tasks.

1. Mechanical Mouse:

Another name of mechanical mouse is ball mouse. Mechanical mouse is a computer input terminal that contains the metal or rubber ball in the back surface side. When we move the mouse then mouse’s ball roll and sensors that are embedded inside identify the motion and move on screen’s surface portion at the same directions. Today, mechanical mouse has been replaced in the Optical mouse. These types of mouse have to need cable (wire) to making connection in computer.

2. Optical Mouse:

In the optical mouse use advance technology such as LED (light-emitting diode), optical sensor, and other DSP (digital signal processing) instead of the rubber ball mechanical mouse. In the optical mouse, detect the movement by the sensors when reflected light. No need the cleaning to optical mouse because it has not contained any moving components.

3. Infrared Frequency Cordless Mouse:

Cordless mouse is also known as wireless mouse, and these types of mouse are connected with computers with the help of different unique technologies such as Bluetooth, RF, or infrared radio waves. In the computer, has to contain USB device that receives the spreaded signals from the wireless mice.

4. Traceball Mouse: