Question about Computers & Internet
Where is it?
Posted by Anonymous on
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Posted on Jan 02, 2017
These keys used to be very useful in console mode (without the GUI). They are still useful in graphical systems.
PrtSc allows you to copy the graphical content of a screen as an image and paste it in document editing program. It copies the whole screen (with windows overlapping as if it were a collage)
Used in conjunction with the SHIFT key it copies the top window (the active window).
The Pause Break key halts the scrolling of a text on the screen in Console Mode. Imagine you are in a Dos system or Linux console and you type Print with the name of a text file. It will start scrolling rapidly across the screen. Pressing the pause Break key allows you to STOP/HALT the scrolling so that you can read what is being shown.
If you are running a long program in console mode (the old way) the program will only print messages to the console when asked to. If a calculation takes to long and you have no idea what it is doing you can push the Break key and the system halt the execution of the program (suspend) until you issue the termination command or the resume command.
The DEL key issue a delete command to erase the highlighted character or word or whole paragraph in text editing mode. If you press CTRL ALT DEL a Windows based system will raise the task manager to allow you to either turn computer OFF, kill a task or what have you. Just try it. On old console based windows (3.2, 98, Me, 2000) it will reboot the system.
The Insert or INS key allows you to toggle between Insert or Overwrite in text editing software.
As to the Sys Req key function, that is not clear, it depends on the hardware you are using. Basically it sends a low-level message to the operating system to force it to interrupt what it was doing to return control to the console operator. Most people will nowadays safely ignore it. Most systems just do that:they ignore it.
Posted on Jul 27, 2010
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May 21, 2010 | Computers & Internet
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