Add script to an item?

I need your help! I've spent hours in Near Infinity, on https://gibberlings3.github.io/iesdp/main.htm and on the various guides listed on shsforums.net/topic/36781-comprehensive-ie-modding-tutorial-index/, but I can't seem to figure this out: is it possible to add a script I created to an item, as you would do with magic effects (e.g. AC bonus (0), Set color (7), Haste (16),...) ? All I got for my troubles is a wicked headache and a lack of sleep :smiley: The only effect I found that seems to be somewhat related to scripts is Modify script state (282) but I have no idea what the hell it does, the description on IESDP doesn't explain what the "Scripting state" is and I have found nothing about it in the guides on SHS :'( Does this require some clever trick ? Is this even possible ? Please, oh wise ones, release me from my torment!