Rob, what I think johne meant was why do Peter & Alex respond as two with only one name.
I should have thought the answer was self explanatory, but, johne, they share a computer as many do, like D&D, JanH (and Mr. JanH), etc. so you see posts from more than one person because they log in on their shared home PC. On the other hand there are a few folks like Camden Tom and Camden Diane that use the same PC for more than one account so they each have their own individual 'handle'.
OK. Now. Why do I feel stupid for answering that one? Dirty somehow, like I have just had a conversation with Joseita?
Tom (aka XR)