David, thank you for your careful reading and advice, not to mention your kind offer to answer any other questions I may have. (You may not realize how dangerous it is to make such an offer to techno-neophytes like me. )

Actually, from my perspective, this thread has turned out to be more interesting and educational than I expected. I appreciate how many of you have taken the time to try to help (and commiserate with others who also struggle with the MS gremlins).

Fran