The Print Screen button (generally located above or to the right of the Backspace key) will copy a snapshot of whatever is currently displayed on your monitor to the clipboard. If you press Alt and then Print Screen, this will copy a snapshot of only the top window that is open on your screen. Opening a new document in Paint, image editing program or Microsoft Word and selecting Paste will copy the screenshot there and allow it to be saved. This is particularly handy for emailing us exactly what that error message looks like – saves you having to write it out long hand!