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A secure attention key (SAK) or secure attention sequence (SAS) [1] is a special key or key combination to be pressed on a computer keyboard before a login screen which must, to the user, be completely trustworthy.
In computing, a modifier key is a special key (or combination) on a computer keyboard that temporarily modifies the normal action of another key when pressed together. By themselves, modifier keys usually do nothing; that is, pressing any of the ⇧ Shift, Alt, or Ctrl keys alone does not (generally) price trigger any action from the computer.
For example, pressing Alt+f in Xfce's terminal emulator window does not move the cursor forward one word, but activates "File" in the menu of the terminal window, unless that is disabled in the emulator's settings. Tab ↹ : Autocompletes from the cursor position. Ctrl+a : Moves the cursor to the line start (equivalent to the key Home).
⌘ Cmd+Ctrl+F or Fn+F: F11: F11: Fullscreen: Show the window in full screen mode, with no border, menubar, toolbar or statusbar Depends on application, system default: ⌘ Cmd+Ctrl+F and Fn+F: Ctrl+⇧ Shift+F: Ctrl+F11: Rollup/down window Win+D Available, but no default: Show all open windows ⊞ Win+Tab ↹: F3 or
An access key allows a computer user to immediately jump to a specific part of a web page via the keyboard. On Wikipedia, access keys allow you to do a lot more—protect a page, show page history, publish your changes, show preview text, and so on.
In other words, it does not matter whether the key would have produced an upper-case or a lower-case letter. The interpretation of the control key with the space, graphics character, and digit keys (ASCII codes 32 to 63) varies between systems. Some will produce the same character code as if the control key were not held down.
A Control key (marked "Ctrl") on a Windows keyboard next to one style of a Windows key, followed in turn by an Alt key The rarely used ISO keyboard symbol for "Control". In computing, a Control keyCtrl is a modifier key which, when pressed in conjunction with another key, performs a special operation (for example, Ctrl+C).
SAS is a software suite that can mine, alter, manage and retrieve data from a variety of sources and perform statistical analysis on it. [3] SAS provides a graphical point-and-click user interface for non-technical users and more through the SAS language.