Whoah, there, Tiger!
Generally, you've given good advice, but I ask everyone that they please Do NOT click on the "refresh" button on your browser when you are using Mudcat. Clicking on the "refresh" button is one of the big things that causes double posting, along with double-clicking on the "submit" box. To refresh your screen, use the controls Max has provided, particularly the grey "refresh" button/box on the Forum menu page.

If you do double post, it's no big deal. Dick Greenhaus does it all the time because he has a computer that stutters (grin). If we haven't deleted your duplicate posts in an hour or so, just go to the Help (click) Forum and post a request for the duplicate messages to be deleted (be sure to give the thread name), and a Joe or JoeClone® will cheerfully delete the duplicates (hey, Clones, be sure you post a message in the Help forum, saying that you've deleted the duplicates, so the rest of us don't go looking for them). There's a link to the Help Forum on the top of most pages at Mudcat - be sure to check out all those interesting links up top.
-Joe Offer-