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The horizontal tab is usually inserted when the Tab key on a standard keyboard is pressed. A vertical tabulation (VT) also exists and has ASCII decimal character code 11 ( Ctrl + K or ^K ), escape character \v .
For example, the key labelled "Backspace" typically produces code 8, "Tab" code 9, "Enter" or "Return" code 13 (though some keyboards might produce code 10 for "Enter"). Many keyboards include keys that do not correspond to any ASCII printable or control character, for example cursor control arrows and word processing functions.
⌘ Cmd+Tab ↹ / ⌘ Cmd+⇧ Shift+Tab ↹ (While in app switching window, ⌘ Cmd+` can be used to select backward, ⌘ Cmd+1 can be used to view selected app's windows) Alt+Tab ↹ / Alt+⇧ Shift+Tab ↹ or Alt+Tab ↹ / Alt+⇧ Shift+Tab ↹ to switch windows within the same application (Gnome) Hold Alt, then quickly press Tab ↹
Xterm has a comprehensive documentation page on the various function-key and mouse input sequence schemes from DEC's VT terminals and various other terminals it emulates. [13] Thomas Dickey has added a lot of support to it over time; [56] he also maintains a list of default keys used by other terminal emulators for comparison. [57]
The VT100 is a video terminal, introduced in August 1978 by Digital Equipment Corporation (DEC). It was one of the first terminals to support ANSI escape codes for cursor control and other tasks, and added a number of extended codes for special features like controlling the status lights on the keyboard.
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Simple one-letter commands following the lead-in included DC2 for cursor-to-home (upper left corner of the screen), FF for up-cursor, VT (vertical tab) for down-cursor, BS (backspace) for cursor-left and DLE for cursor-right, and FS (form separator) for clear screen. [6] SI cleared to the end of the line, ETB to the end of the screen. [7]
Prior to the VT220, if an Escape key was present, it was positioned in the upper left corner of the keyboard. The VT220 moved it to the typical location for the f11 key, in the middle of the top row of keys. For users of the TECO editor, in which it is heavily used, this was inconvenient. [7] [8]