Start your  GEANT321 executable module 
(linked with GXINT321 and Motif1.2);
 type `m' as workstation type;
 click the left button of the mouse after positioning the cursor on the 
string VOLU in the browser;
 click the left button of the mouse after positioning the cursor on 
any icon in the main area of the browser;
 click now the right button of the mouse and keep it pressed;
 move the mouse to select the action `Tree' and release the button;
 the drawing of the logical tree will be displayed in the graphics
window;
 position the cursor on the drawing of a box (containing a volume name)
in the graphics window, click the right button and keep it pressed;
 release the button selecting the action `Dspec';
 the command DSPEC for that volume will be executed in a separate
window;
 repeat the exercise selecting this time the action `Dspe3d';
 the DSPEC will be executed in the first window, the volume 
specifications will be printed in a separate window and a Motif panel will
appear;
 click the left button of the mouse positioning the cursor in the Motif
panel on the `Value changed' button, and select the DRAG option;
 click now the left button on the `activating box' on the right of
the `Theta' slider;
 click on the `Theta' slider and, keeping pressed the left button of the
mouse, move it right-wards;
 the drawing in the graphics window will rotate;
 release the button and type `igset 2buf 1' in the executive window;
 restart moving the slider as before.
S.Giani