IMPORTANT TROUBLE SHOOTING TIPS:
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If cookies are not enabled in your browser your web addresses will be lost when you leave the page.
Site URL must be in the form protocol://domain.suffix/ for example http://31415.org/
If a site misbehaves and takes over the entire screen go back to "Pi" click on "Oversite" then very quickly click your browser's stop button (normally an X) before the bad site loads
then change web address from the offending site.