The GEANT data structures are
considered as KUIP browsable classes and their
contents as `objects' on which one can perform actions
(the GEANT commands).
According to the Motif conventions, an object can be selected clicking the
left button of the mouse (when the cursor is on the icon representing that
object). Clicking then on the right button of the mouse, a menu of possible
commands will appear (double clicking on the left button the first action of
this list will be executed);
the selected command will perform the relative actions
on the selected object. Such actions (like drawing, for example) can be
executed either directly or via the use of an automatically opened Motif panel.
Objects drawn in the graphics window can be `picked' as well (for example,
volumes, tracks, hits); clicking the right button when the cursor is on the
selected object, a menu of possible actions on that object is displayed.
Users can finally define Motif panels containing buttons corresponding to the
most frequently used commands. An on-line help is available for any specific
subject.