Apologies to all,
Thanks for your messages.
the way i got it to work was to send the URL via a form.
It looks like the page i was passing it to was looking for a form value to retrieve.
I had no idea as i have no documentation for it.
Maybe that is not the full story, but it works this way, and not with a simple link passing a url value.
I've just found that out.
Thanks a lot.
Vinny