Screen Marker is a small and very simple program that can be used to draw directly on the desktop on top of open windows. It can be used to create screenshots with selected controls, focus the viewer's attention during a presentation or during a remote administration session. Unlike the utilities that can draw on screen shots, the Screen Marker works in real time, which means that you can pause it right during the presentation and highlight something on the screen.
The interface of the program is extremely simple and consists of two control elements: a color selection button, which opens a standard window with the proposed variants of different colors, and the Enable/Disable button, which serves to enable the drawing mode. Pressing it again will turn off the program and clear the screen.
According to the author's idea, there should be several drawing tools in Screen Marker, but at the moment it seems that the program is no longer being developed and only Free Hand tool is available - the analogue of "Brush" or "Pencil" tools, which are present in almost every graphical editor.