>Input is the term denoting either an entrance or changes which are inserted into a system and which activate/modify a process. It is an abstract concept, used in the modeling, system(s) design and system(s) exploitation.
>Whenever you enter data into your computer, it is referred to as input. This can be text typed in a word processing document, keywords entered in a search engine's search box, or data entered into a spreadsheet. Input can be something as simple as moving the mouse or clicking the mouse button or it can be as complex as scanning a document or downloading photos from a digital camera.
B. Differentiate among a program, command, and user response.
>Input as a program is a utility program that organizes the input to a computer while input as command is the act of entering data into a computer or data processing system while input as a user response is an opinion or recommendation offered as a guide to action, conduct.
2. The keys and buttons commonly found on the desktop computer keyboards:
3. Different mouse types and how to use:
· Mechanical mouse: Houses a hard rubber ball that rolls as the mouse is moved. Sensors inside the mouse body detect the movement and translate it into information that the computer interprets.
· Optical mouse: Uses an LED sensor to detect tabletop movement and then sends off that information to the computer for merry munching
· Infrared (IR) or radio frequency cordless mouse: With both these types, the mouse relays a signal to a base station wired to the computer's mouse port. The cordless mouse requires power, which comes in the form of batteries.
· A mouse with many buttons: The extra buttons can be programmed to do specific things, such as navigate the Web or turn pages when you’re reading a document. The typical button-ified mouse has about five buttons.
· Trackball mouse: Like an upside-down mouse. Rather than roll the mouse around, you use your thumb or index finger to roll a ball on top of the mouse. The whole contraption stays stationary, so it doesn’t need a lot of room, and its cord never gets tangled.
· Stylus mouse: Another mouse mutation enjoyed by the artistic type is the stylus mouse, which looks like a pen and draws on a special pad.
4. Various types of touch screens:
1. Resistive Touchscreen: Resistive touch screens are the most widely used touch screens in mobile phones. They are cheap and resistant to water and dust, but they get easily scratched and cannot be used with sharp objects.
2. Capacitive touchscreen: Capacitive touchscreens are basically of two types- one that can recognize multiple touches simultaneously and the other which cannot.
3. Infrared touchscreens: Infrared touchscreens are the most expensive of the all the three mentioned here. It doesn’t require physical force, just a gentle touch is enough.
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