Mark, just to add to Allan's excellent response regarding the usage of your last name, let me direct you to the other posts on the board. All of us regular contributors use our last names...even those of us whose name is familiar to all and even ones that have names that might be unique.

There are many Mark's on this board and without a last name, we would not know to whom we are talking. If, of course, your name was "Cher" or "Twiggy" or even "The Count" or "the General"
as we so loving refer to Stu and Chuck, then that would be fine. Be you see, we even know who they are.

This is a very friendly board and the contributors feel as if it is family we are speaking to. We would love to have you join us, but please, include your last name (even if it is fictious.)