Taking screenshots can be useful, such as it being a record of an online transaction. To grab the whole screen, use ç+ß+3. If you don’t need the whole screen, you can grab either a selected area or a window. To grab an area you define, press ç+ß+4 and then drag the crosshairs over the area you want to grab and let go. To grab a window, press ç+ß+4 and then [Spacebar]. Hover the camera icon over the window you want to capture and press the mouse or trackpad button.