Hooray we are back (thanks to Alan) I was about to have a bit of a grumble on the forum about the loss of spontaneity and humour. I even joined the other list but there is too many e-mails some very interesting, some over my head, and lot's OT. I hope every body rejoins here and we get back to normal. Thanks again Alan Lee Grant MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.