Using the screen printing feature on Mac will allow you to make a capture of anything that appears on your screen or from an area of your screen or only from an open window. If you want to know how to use the screen printing function on your Mac, just follow these few steps. 1. Take a picture of your entire screen. Locate the capture area, and then press the cmd + shift +3 command . This will trigger the capture of your entire screen. You will even hear the shutter sound of the camera confirming that you have made a screenshot. 2. Take a picture of your screen, in the form of a rectangle. To do this, simply press cmd + shift + 4 . This will turn your mouse into a tool that will allow you to select an area of your screen in the form of a rectangle. The tool will look a bit like a positive sign (+). Once the tool is in place, you can release the other keys. Then, click and hold, then drag the tool until you have created the desired rectangular shape and then, as soon as you are ready to take the picture, release the mouse. 3. Make a screenshot of one of the windows. This is a great option if you have an open window and want to take a picture without your desktop in the background or anything else that has appeared on your screen. Press cmd + shift + 4 + spacebar and wait for the tool that captures in rectangular shape to turn into a camera. Then move the camera with your mouse until you have found the area of your screen that you want to capture - it will appear a little discolored. 4. Open the saved photo on the desktop. Simply double-click on the file. If you want to save your screenshots to the clipboard instead of a permanent file, just press ctrl in addition to the other functions, the next time you do a screenshot. 5. Print this screenshot (optional). If you want to print the screenshot, just click on "file" then "print" and "new print".