Control button

Control key labeled "Ctrl" on a French Windows keyboard

The control key , labeled with Ctrl , in Switzerland Control key , labeled with Ctrl , is a key for calling up additional functions: Strg or Ctrl

On conventional PC keyboards it is located far left of the bottom row of keys just below the Shift key ( Shift key) and usually a second time at the bottom right, to the left of the arrow keys. Most applications do not differentiate between left and right keystrokes, but computer games make use of it.

Sometimes the key is incorrectly referred to in Germany as the “String”, “Strong” or even “Strange” key, but more often the individual letters “Strg” are pronounced instead of the word “Control”. In Switzerland , the button is Ctrlusually pronounced as "Control", rarely spelled.

functionality

The control key is usually not used alone, but usually executes a command in combination with another key or calls up a program function (an exception in newer Windows versions is the option, which is switched off by default, to find the mouse pointer by pressing the key) . So you can, for example, Strg+ Ccopy text and with him Strg+ VInsert ( copy and paste to have) without typing break and use the mouse. The Alt key and Alt-Gr key are additional keys that are somewhat newer in terms of computer history and function according to this principle.

Press the control key together with another key results in PCs to the ASCII -Entsprechung the second key to 1F _hex (00011111 _bin ) bitwise AND operation is. This causes the sixth to eighth bit of the ASCII coding of the corresponding key to be cut off and the return value to be a number that corresponds to one of the first 32 ASCII codings, i.e. a specific control function.

Each of the ASCII capital letters is assigned a function whose code is exactly 64 smaller than the code of the respective letter. Lower case letters activate the same functions as the corresponding upper case letters, except that 96 is not deducted from their code, since the codes of the lower case and upper case letters differ by 32 each.

Today, most of these control functions are no longer used to control devices, but rather to control various software packages through keyboard combinations.

Common control button combinations

Many programs allow functions to be triggered using the keyboard instead of the mouse and menus. In the menus there is often to the right of the respective function how it can be carried out more quickly using a key combination . However, the combinations may differ depending on the program. The following table describes the combinations with German / Austrian and Swiss keyboard layout.

Germany Austria	Switzerland	executed command
`Strg`+ `Alt`+`Entf`	`Ctrl`+ `Alt`+`Del`	Calling a locking dialog or a task manager with different operating systems (" grip ")
`Strg`+ `→`or `Strg`+`←`	`Ctrl`+ `→`or `Ctrl`+`←`	word-by-word jumping in a text or input field (with the arrow keys )
`Strg`+ `Umschalt`+ `→`or `Strg`+ `Umschalt`+`←`	`Ctrl`+ `Shift`+ `→`or `Ctrl`+ `Shift`+`←`	Word-by-word marking in a text or input field
`Strg`+ `Backspace`or `Strg`+`Entf`	`Ctrl`+ `Backspace`or `Ctrl`+`Del`	delete word by word in a text or input field
`Strg`+ `Ende`or `Strg`+`Pos1`	`Ctrl`+ `End`or `Ctrl`+`Home`	Jump to the end or the beginning of a text
`Strg`+ `Umschalt`+ `Ende`or `Strg`+ `Umschalt`+`Pos1`	`Ctrl`+ `Shift`+ `End`or `Ctrl`+ `Shift`+`Home`	Mark up to the end or beginning of a text
If you press the Ctrl key and mark / click with the mouse at the same time, you can select individual, separate objects in many applications, e.g. items from a list (e.g. file selection) or non-contiguous text areas in word processing (works among other things in all StarOffice Writer and OpenOffice.org Writer as well as newer Microsoft Word versions).
`Strg`+ `+`or`−`	`Ctrl`+ `+`or`−`	enables an enlarged / reduced page display ( Internet Explorer , Opera ) or a larger text display ( Mozilla , Netscape ) in many web browsers . Alternatively, in these applications, while holding down the Ctrl key, the mouse's scroll wheel can often be rolled down (corresponds to `-`) or up (corresponds to `+`). `Strg`+ `0`resets the display to the original value.
`Strg`+`C`	`Ctrl`+`C`	for programs in the terminal: aborts the current program, see also the break key ; For graphic programs: copies the selected items to the clipboard (from copy ).
`Strg`+`D`	`Ctrl`+`D`	for programs in the terminal: ends a text entry, d. H. the current program receives the status end of file EOF ; with graphic programs: function depends on the program.
`Strg`+`Z`	`Ctrl`+`Z`	for programs in the terminal: stops the current program without canceling it. It can be continued later or pushed to the background; With graphic programs: Cancels the last action ( back ), so-called "Undo".
`Strg`+`Q`	`Ctrl`+`Q`	aborts programs (from quit ).
`Strg`+`Y`	`Ctrl`+`Y`	retrieves, "Undo" undoes, or a line of text (for example, in many source - editors ) is deleted.
`Strg`+`A`	`Ctrl`+`A`	highlights the entire content of a document or text field
`Strg`+ `C`or `Strg`+`Einfg`	`Ctrl`+ `C`or `Ctrl`+`Ins`	copies labeled (Engl. to the buffer copy )
`Strg`+`X`	`Ctrl`+`X`	Copies the marked into the buffer and deletes it at the place of origin (English cut )
`Strg`+ `V`or `Umschalt`+`Einfg`	`Ctrl`+ `V`or `Shift`+`Ins`	inserts copied items from the buffer to the input point ( paste )
`Strg`+`F`	`Ctrl`+`F`	Search function (from English find )
`Strg`+`H`	`Ctrl`+`H`	History or replace
`Strg`+`P`	`Ctrl`+`P`	Print function (of English. Print )
`Strg`+`S`	`Ctrl`+`S`	Memory function (of English. Save )
`Strg`+`M`	`Ctrl`+`M`	provides audio playback mute (of English. mute )
`Strg`+`N`	`Ctrl`+`N`	adds new file (of English. new )
`Strg`+`T`	`Ctrl`+`T`	opens new tab
`Strg`+`W`	`Ctrl`+`W`	Close tab (from withdraw )

history

With older PC types (original IBM-PC , IBM XT , IBM AT ), and with many non-personal computers, for example Commodore 64 , Atari ST , Apple II and some Unix computers, the key is located above the shift key , either to the left of the "A" or to the left of the "Q". With some operating systems, this ergonomic position can be restored using software.

On old computer architectures, the Ctrl key was used to generate the first 32 codes (000 to 031) of the ASCII table , the so-called control characters . These 32 non-printing characters did not correspond to symbolic representations on the output devices (originally they were mostly teleprinters ) , but device-controlling functions such as BEL ( bell , octal code: \ 007, Ctrl + G), which causes the device bell (today a beep ) will sound, LF ( line feed , engl. Line Feed , octal code: \ 012, Ctrl + J), which produces a line feed, BS ( Backspace , octal code: \ 010, Ctrl + H), which moves the printhead one step back to the left etc.

Individual evidence

↑ http://www.tastatur-taste.de/ctrl-taste/

[1] ttp://www.tastatur-taste.de/ctrl-taste/

Esc	F1	F2	F3	F4	F5	F6	F7	F8	F9	F10	F11	F12	Print S-Dep	roll	pause break	Numeric keypad :

													Insert	Pos1	Image ↑	Num	/	*	-
													Dist	The End	Image ↓	7th	8th	9	+
																4th	5	6th	+
														↑		1	2	3	Enter
													←	↓	→	0		,	Enter

Control button

contents

functionality

Common control button combinations

history

See also

Individual evidence