Hold down the Control (ctrl) key, and tap the Print Screen (Prt Sc) key, let go.
To run Paint, click the Start button, Programs, Accessories, Paint.
Click Edit menu, click Paste.
Using the mouse, click and select the area of the key sheet you wish to keep.
Click Crop.
Click File menu, click Save. (Use the file type PNG for best quality)

Hold down the Control key, and tap the Print Screen key.
To run Paint, click the Start button, Programs, Accessories, Paint.
Click Paste.
Using the mouse, click and select the area of the key sheet you wish to keep.
Click Crop.
Click the small Disk Icon at the top to save. (Use the file type PNG for best quality)

To use the Snipping Tool, click the start button, and type: Snipping Tool, press enter.
Using the mouse, click and select the area of the key sheet you wish to keep,
let go of the mouse button, hit Save. (Use the file type PNG for best quality)

To capture a specific application window, press Command-Shift-4, then press the Spacebar.
The cursor will change to a camera, and you can move it around the screen.
As you move the cursor over an application window, the window will be highlighted.
The entire window does not need to be visible for you to capture it.
When you have the cursor over a window you want to capture,
just click the mouse button and the screen shot will be saved as a PNG file on your desktop.
The file is saved as PDF in Mac OS 10.3 and earlier.