Grahame, you will see your sharer's code as *X, we would see you as "something X". If you go to PP > Help > About PlanePlotter at the end of the top line you will see your full sharer code which is what other PP users would see.
BTW, overnight Bev released an upgrade PP ver 5.4.7.5.
Also there is some news of a cheap ADS-B receiver which will work with PP.
http://www.radargadgets.com/