The GAMGI main interface is divided in 5 distinct sections, from top to bottom: Menus, Drawing, Tools, Commands and Status.

Most GAMGI functionality is available through the object-oriented Menus. Each menu entry has the name of an object and is the entering point for all tasks related with that object. For the sake of consistency, even Help, File and Gamgi are regarded as objects. Objects are presented in hierarchical order, when performing a direct (counter-clockwise) rotation, from bottom left to top left.

Help objects are at the bottom of the hierarchy, because they have the responsibility of explaining all the other GAMGI objects. Help facilities in GAMGI are accessed through the Help menu only.

The 17 objects that provide all the real functionality in GAMGI come next, represented by menus with their names: Text, Orbital, Bond, Atom, Direction, Plane, Group, Molecule, Cluster, Cell, Arrow, Shape, Graph, Assembly, Light, Layer and Window.

Files comes next in the hierarchy, because they can include and describe all the previous objects. Input/output operations in GAMGI are accessed through the File menu only.

Finally, global aspects of GAMGI functionality are controlled through the Gamgi menu, which is therefore the highest object in the hierarchy.

To request a task related with any of these objects, press the mouse (left button) over the corresponding menu label in the window. This pops up a second menu allowing to choose which kind of task to accomplish: Current, Topic, Search, General, Tutorial, Remote, for Help; Create, Copy, Select, Link, Modify, Measure, Animate, Remove, for the 17 functional objects; Import, Export, for File; About, Reset, Exit, for Gamgi.