I tried forming my search
String with:
"Professional Certification � Developer Certification"
prepended to it. So to find all posts from Mark about lock or unlock, I searched for:
"Professional Certification � Developer Certification Mark Spritzler lock unlock"
and got 44 results.
All 44 appear to be from the Developer Certification forum. I didn't click on all 44, so I may not be absolutely correct, but its close.