The geometry window (to the right) shows points, vectors, segments, polygons, functions, straight lines and conic sections graphically. Whenever the mouse is moved over an object a description appears. The geometry window will be called drawing pad sometimes.
There are several modes to tell GeoGebra how it should react to mouse input (new point, intersect, circle through three points, ...). This aspect will be explained in detail later (3.2).
Double click an object in the algebra window to open its editing field.