DavidR--Welcome. If you've been lurking for a time you have a pretty good idea of what to expect here. As for contributions, in my view they come in various forms. Those include not only providing information but asking interesting, offbeat, or important questions. I know that for me personally, sometimes it is the questions which really start my mind to ticking and lead my thoughts in directions (or cause me to resurrect past experiences) that otherwise wouldn't have happened. Glad to have you aboard.