Okay, I was motivated by curiosity to join the group. Sorry, can't claim to be heroically endowed but have performed well to partners' satisfaction on occasion. Elsewhere on the net I see questions that I sometimes feel competent to answer, and if I can be of help to any other member(s) of this group, I'll be glad to try to be. Otherwise, will read what you guys send with interest. Cheers, Bobk.