This is an extremely common question. It is supposed to be in the Designer FAQ, but even still, I don’t think you searched. Here are a few topics with a discussion of what your question:
I am not picking on anyone directly. Really. :-) But please, everyone, [b]please[/b] use the search feature before you post. We spent a lot of time converting nearly four years of discussion from the BUSOB-L listserv in order to preserve the information. And one of the above topics was more recent than that.
Another benefit of searching, especially as we go forward with Bob (this forum), is that if anyone has marked the older topic to watch and it is brought back to the top for further discussion, they will be notified. If a new topic is started, then they won’t.
(BOB member since 2002-06-06)