Digital blackboard for writing and drawing by hand (with digital pen). Only for Windows!8 blackboards 4 colors (white, red, green, blue)Erase, Clear, Save. It can be used for online lessons in Mathematics, Physics, Chemistry.Each image (blackboard) must be saved separately!The images are saved in the folder where the application is.Images names are automatic: Blackboard1.png, Blackboard2.png, ... Blackboard8.png. To avoid overwriting, put the images in separate folders, named with the name of th