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Hold the Alt key and press print screen. I am not sure that that will work on all OSs but it will on windows. You can then open a word processing program (Word for example), right click and select paste.
here's what i do on my windows XP:
1. press the "Print Screen" button. (found in upper right hand corner)
2. open paint on accessories.
3. press ctrl+V.
i got this off of the runescape guide that my brother has.
For Windows systems can I add this to other answers. The Print Screen key copies the entire display (image 1) and holding down the Alt key while pressing Print Screen copies only the active window (image 2).


On a Mac it is the apple key, shift and the number 3. Hold all three down together and that will take a screen shot and save it to your desktop. The apple key, shift and 4 lets you drag a box across your screen and take a shot of just what you want instead of the entire screen.
on the top right of your keybord there's the print screen button.
I use a wonderful program that a fellow ABer told me about called "Snagit." It's simple!
I do what the others have mentioned, but I also use the "Snipping Tool" if I want just a specific portion of the screen, or even an image, or partial image from a paused video. I'm using Vista.
This question was asked on someone elses behalf.
This answer is to help Windows users only.
The Windows Print Screen Key can be a powerful tool if you know how to use it to its full potential.
The sole function of this key is to take a snapshot or picture of your computer screen and copy it to the clipboard (the clipboard is an invisible holding area for content that is copied). Its the same thing as if you copied something from a document and it is now on your clipboard waiting to be pasted in its final destination. Its that simple.
The Print Screen key may appear differently depending on the manufacturer of your Windows keyboard. The standard position would be at the upper right hand corner of your keyboard and may appear within this sequence of keys...
F9 > F10 > F11 > F12 > Print Screen > Scroll Lock > Pause/Break
It is often abbreviated Prt Scr.
To capture your screen content simply press the Print Screen button.
Now, how do you get to see those Screen Captures or maybe even send them to someone? The quickest and most effective method is to have a graphics editing program handy. If that is not an option, you can open your favorite word processing program and create a new document. Position your cursor at the beginning of the document or wherever you want the screenshot to appear.
Using your keyboard, press Ctrl + V which will Paste the screenshot in your open document. Now you can Save (Ctrl + S) the document to wherever you wish, make sure to name it appropriately so you can easily find it.
You can now send this file to anyone via email, use it in a presentation, create your own little book of screenshots showing how to perform a specific task, etc. The possibilities are endless.
Text Source:
http://www.seoconsultants.com/windows/print-screen/ [Edited]
Image of a standard keyboard:
http://www.seoconsultants.com/windows/keyboard/
Image of a Dell Latitude laptop keyboard:

for a mac, you hold apple (or command) shift 3 to take a full screen shot, or if you want to just choose a certain area, change the 3 to a 4 and drag around the part you want.
all you gotta do is hit the print scrn button on your keyboard (windows) you can then open up microsoft word and press contro v (paste)
I know very simple and nice tool for make, edit, save and share screenshots http://xscreenshot.com. It works on Windows, Linux and Mac
Very useful for games and share screenshots on forums, chats etc...
I use 5clicks.com program. It allows me to print the captured screen. Download it from here: http://www.screen-capture.net/
It's very inexpensive program and I've been using it for many years. I highly recommend it.
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You're reading How do you take a screenshot on a Windows PC, Linux PC or an Apple MAC? (Dummies guide please!)
Comments
Excuse my ignorance but what is a screenshot ? Is it an image of the page you are looking at ? And if it is , can you save it and send it to someone ?
by ChelseaMark on November 2nd, 2007
A screenshot is an image which saves exactly what your screen is currently showing. Normally Windows copies a screenshot to your "clipboard" - you can then paste it into an image program, save it, and use it however you like. You can send people screenshots.
by nevets - away on November 2nd, 2007
@Meow Meow: Good advice for Windows uers - when you press the "Alt" key you only capture an image of the currently opened window.
Thank you for answering. :-)
by nevets - away on November 2nd, 2007
I don't like people to see my entire desktop so I am in the habit of holding Alt for only the selected window.
by Meow Meow 1BadMutha TBMF on November 2nd, 2007
@ChelseaMark:
Here is a screenshot of my browser window: http://img140.imageshack.us/my.php?image=deleteqe5.png
@Miao:
Good point. :-)
by nevets - away on November 2nd, 2007
Thanks a lot.
by ChelseaMark on November 2nd, 2007
Sneaky point. I mostly use this function at work and don't want people to see how many browser windows I have open. ; )
by Meow Meow 1BadMutha TBMF on November 2nd, 2007
:-)
This question is primarily intended for very green users, some of which don't know where the print-screen button even is... it's a shame we can't "print-keyboard"!
by nevets - away on November 2nd, 2007
Then I'll just teach them to be sneaky straight out of the gate. LOL
by Meow Meow 1BadMutha TBMF on November 2nd, 2007