You close Clearboard windows by selecting the “Close Window” item in the File menu. If the current window contains an image that has not been saved you will be prompted to save the image. Selecting “Yes” will result in the image being saved. Selecting “No” will skip the saving process. If there are other Clearboard windows open the current window will be closed. If it is the only Clearboard Window open you will be asked to confirm that you want to exit the Clearboard application. An answer of yes will result in the Clearboard clapplication closing.