First of all, I have to pay some money to take it, so I tried to get information about this exam.
I would talk about a pattern whose name I fail to know before, giving it the name of multi-singleton.
I read about it in PHP 5 certification study guide from php|architect's series. This is the example given:
Google webmaster tool signals scanning errors. The is option to signal error a scorrected, but sometime a lot of error is solved at once, but interface do not give option to select it all.
Also this trick could be usefull in other service..
I loaded this code in chrome console (developer tool), modified from example code https://developer.mozilla.org/en/DOM/element.dispatchEvent