The program interface is based on the popular multiple window interface. Program interface is shown on the picture:
At the top of the main window there is a main menu of the program, the toolbars are below it, the status bar is at the bottom. Guides windows and tables are located in the middle area. There are two modes of windows:
Child windows can be placed inside the main window (as cascade or aligned horizontally/vertically). Floating windows can be attached to the borders of the main window or to each other.