Clickthrough, or clickthrough rate (CTR), is the percentage at which viewers click on online ads and go to the advertiser’s site – whether to sign up for something, to make a purchase, or just to find out more.
The clickthrough percentage calculation is arrived at by dividing the gross number of clicks by the gross number of advertising impressions served.
In computer graphics, a color look-up table, or CLUT, is the set of available colors for a given application.
For example, a 24-bit system can display 16 million unique colors, but a given program would use only 256 of them at a time if the display is in 256-color mode. The CLUT in this case would consist of the 16 million colors, but the program’s palette would contain only the 256-color subset. To avoid dithering (i.e., varying the pattern of dots in an image) on 8-bit machines, you should only use colors from a predesignated CLUT.
A program or application that will work on any peripheral devices within a certain protocol is considered device independent.
Dialing a telephone number is a simple example of a device-independent action. All telephones operate under the same protocol. No matter what brand of telephone you use, you can always phone home. Device independence ensures that all internet-enabled devices — everything from your games console to a Web-surfing clock radio — will be able to communicate with each other in the future.
Events are user interactions with their computer, such as a mouse click or key press.
In the good ol’ days, computers handled user interactions as input of batched data. The user fed a hunk of data in, the computer did something to that data, then produced the results. With the advent of interactive devices like the GUI interface, computers could display answers to computations onscreen. The input for these interactions are events caused by the user, which could be keystrokes, button clicks, or the position of the mouse pointer.
(see Event Handler).
Event handlers are functions that handle client-side events.