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A screenshot is a picture of the current view of a computer's visual output. Common output formats are JPEG, BMP, or PNG.

MAC OS X

To do a screenshot on a Mac, follow these instructions:

1. Hold down the apple key and the shift key.
2. Press and let go of the number 4 key.
3. Instead of having an arrow as your cursor, a selection crosshairs will appear.
4. You then will hold down the mouse and drag the mouse until you have highlighted all the material you want in your screenshot.
5. Once you have let go of the mouse, the screenshot that you have taken, will appear on the desktop as a PNG file. It acts like a picture file.

OR

For a whole screenshot

1. Hold down the apple key and the shift key.
2. Press and let go of the number 3 key.
3. The screenshot that you have taken, will appear on the desktop as a PNG file. It acts like a picture file.

Microsoft Windows

Entire screen

Take a screenshot of the entire screen by taking the following steps:

1. Press the Print Screen key. This will copy the screenshot to the clipboard.
2. Open an image editing program such as Adobe Photoshop, GIMP, MS Paint, or Paint.net.
3. Create a new document in the image editing application of choice.
4. Paste the contents of your clipboard into your new document.