If you want to print from Heart-NC using Paint, export the files you want to print on your desktop, open Paint, press Ctrl + O key combination, select the Heart-NC files and open them. After that, press Ctrl + P, configure the printing settings and click Print. If you want to switch to Windows screen, you will need only to press Alt + Tab keys. If you want to print some graphics that can't be exported, press the Print Screen button from your keyboard, open Paint and then press Ctrl + V. Once you open the image in Paint, you can edit it or print it using Ctrl + P.