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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).
This term designates the cheapest type of printing by card printers. These printers print up to 5 mm from the edge of the card stock. Direct to Card, also known as "Edge to Edge Printing". The print-head comes in direct contact with the card. This printing type is the most popular nowadays, mostly due to cost factor.
Pressing this button will take a screenshot and save it to the clipboard. To take a screenshot of just the active window, hold down the "Alt" key and then press the "Print Screen" key. Note that on some laptop keyboards the "Print Screen", "PrntScrn", or "PrtSc" label is in a different colour (often green, orange, or blue) from the letter keys.
For example, the Logitech Illuminated Keyboard has an FN key where the menu key is usually found; pressing FN, together with the keyboard's print screen key (above home), produces the Menu key function. Programmers using the Windows API can intercept this key by looking for a WM_KEYDOWN message with wParam VK_APPS (defined as 0x5D in winuser.h ...
On 84-key keyboards (except the 84-key IBM Model M space saver keyboard), SysRq was a key of its own. On the later 101-key keyboard, it shares a physical key with the Print screen key function. The Alt key must be held down while pressing this dual-function key to invoke SysRq. This continues through modern PC keyboards.
Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
Pressing the Scroll Lock key in the Linux console while the text is scrolling through the screen freezes the console output (but not input) during which no further text is sent to the screen, while the program continues running as usual, or become blocked at the write syscall when too much data prevented from reaching the terminal caused the tty's output queue to become full and the tty file ...
Printing is a process for mass reproducing text and images using a master form or template. The earliest non-paper products involving printing include cylinder seals and objects such as the Cyrus Cylinder and the Cylinders of Nabonidus.