Screen-Shooter is a handy little screengrabber which is simple to use:
Clicking on the bottom or right-hand panel button with mouse button one (which is generally the left mouse button) takes a picture of the entire desktop .
Clicking on the top or left-hand panel button with mouse button one allows you to select a window or an area for Screen-Shooter to grab. If you want to select a single window, click the mouse in it. If you want a different area, click and drag the mouse to select a rectangle, then release it.