Right click to open your inventory. It appears at the bottom of your 
video screen. You will notice that you carry only a disc and a small 
stick.

Go forward, and then turn to the left. Walk forward twice towards 
the bandit camp. Speak to the guard using any one conversation icon. 
It is immediately apparent that the guard is terribly unfriendly. 
He offers to shoot you. If you bother him again he will hit you over 
the head with his machine gun and you will be returned to your starting 
point in the desert.

Turn to your right and climb up the hill. Turn slightly left and go 
forward towards the archway. 

Another guard spots you and beckons you over with a nasty intent. 
The Targui suddenly appears behind the guard and saves you. Turn 
back slightly right towards the arch and go forward once, then turn 
right and enter the cave.