re: aexo Paul - You buy & sell them just like the fully paid shares - only on the exp date you have to cough up the exercise price - For AEXO that is 5cents on 30/6/08
Most will sell them before that date, those that want to move into the fully paids & if they are in the money then will convert them.
At the moment just buy & sell using the AEXO code
cheers