[tt][/tt]The easiest solution both in terms of thinking or in term of applying, is to restrict item itself.
Btw about the "I'm only a...", personally I stopped school at 20 years (instead of 18y, after 2 years of fail school). School means nothing, nor your professionnal status. I'm near 25y old, never worked, and stopped school at 20y. I'm not Java engineer or even informatic something. I "leanrt" L2J on the fly, around 1,5 year ago without opening a single book about Java.
You ask a code which is 2 lines long. I gave where you must put (3rd time, itemhandler) and code itself. Putting it in itemhandler directly, you only need a zone restriction (which I shared), nothing more. All others methods (accesslevels, wtf) will need more checks.
You still didn't post any code so far, so for me it's my final post on that thread.
Regards,
Tk.
PS : Malzahax code is obviously wrong (replace || for && and put all zones in a ( ) ) and made for general item uses. Don't need any check on isAio if you put check directly on the itemhandler.
PS2 : Learn how to use Eclipse search tool, and search for "itemhandler". This is your best friend after Google.