Thanks, HandsFree. Appreciate your suggestion, I did not know how to contact him.
However, I have a few minutes ago eventually found the solution: - I was being "blind" - duh!!!
The answer is to use the red lazer pen, not the ink-pen!!!! I can't believe I missed that simple answer for so long.
Anyway, I must say I enjoyed this game, it is very well done, as are many of the RON games.