If the toggle ``rot'', in the bottom frame of the working window, is on, a window appears and you can use the left mouse button on the drawing window. Move the mouse while pressing the left button, the objects visualized follow the mouse movements. You can save a position in an editable file, to read it another time. The rotation is defined by three angles of rotation around the x, y and z axes.
If the toggle ``zoom'' is on, a window appears and you can use it to redefine interactivly a zoom boxe. You can save it in a editable file and read it again another time.