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what has happened is that the directive has started another program. It s often reflected in changes of prompt. So, even the same word can mean different things in different modes. In more user-friendly terms, a mode is really a context. The next efficiency derivative is creating specific keys to be used in combination with the typewriter keys the letters, numbers, and punctuation as an alternative to typing codes. This is especially efficient when the directive is for a different mode; otherwise, two directives would have to be made: one to change the mode and one for the desired directive. The next derivative of this is creating specific keys to be the equivalent of combinations of other keys, for one-touch directives. Each of these keys holds a sequence of characters. This is what a function key (F-key) is. Actually, nearly all of the extra (nontypewriter) keys are sequence keys. The further derivative of this is inserting a level of indirection, logically attaching a sequence to a directive (or pieces of information, or multiple directives), which the user can specify. This can be done directly by the user or by recording keystrokes. Finally, a move toward both efficiency and user-friendliness is a form placing (and labeling) several types of information on the screen at the same time. It can be interactive or noninteractive with the computer. The interactive form is processed one field at a time, as the field is entered; the noninteractive form requires submission of the entire form to interact with the computer. A form is the most extensive use of screen coordinates. Effectively, it also allows several modes to be addressed at the same time. Actually, it enables the equivalent of several directives at the same time, all prompted. A form has a degree of putting the user in control of the interaction.
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Also, a form allows specifying choices from lists of available options, for example, by typing an X next to them. And a form can have a menu right on it; if there s not enough space for that, it can list a key or directive that displays the menu. So, even a nongraphic configuration can be made very user-friendly very clear all along the way.
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Direct interaction with prompts is caused by a program operating system (OS) or application reading from the screen. The program could have immediately preceded the read with a display of the prompt, or it could have displayed the prompt previously and placed the cursor appropriately. The most direct processing of the read text is evaluation and branching, with successive conditional tests, and error messages for any text that doesn t meet all of the requirements the program has for a directive in the current context. This is an example of the processes of a command interpreter. As relatively advanced an interface as a form is, the interactive implementation is as simple as moving the cursor from field to field, handling each directly. The noninteractive implementation entails mapping the fields to a set of variables and handling the set, addressing the variables in any order. More-indirect processing by a program is possible with some automatic processing, most likely provided by the compiler. One example of this is that a piece of code can be named a specific way to be automatically branched to when a corresponding key is pressed. A fourth-generation version involves another level of indirection: it allows code to be named in any way but requires the key to be assigned to that name. On an interactive computer, a very different implementation, keystroke processing, has a very straightforward name. It processes one keystroke at a time, allowing any key to direct any process. In normal interactive mode, the system will automatically send each typewriter key to that user s screen; this is echoing. Echoing can be turned off; a good reason to do this is for password entry. Also, the normal configuration requires a delimiter key for example, a Return, Enter, or F-key for the program to receive the text. In keystroke processing mode, the program receives each key; it doesn t require a delimiter. There is no automatic echoing; the program itself does the echoing, most simply by just displaying the pressed key at the current location of the cursor. But, again, the program can do anything with any key. A simple example of this is that it can monitor the position of the cursor on its line and, when needed, find the farthest-right space, blank-out back to it, and display the current word on the next line. This is the process of text wrapping.
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