Correct Usage of nlapiScheduleScript()

Currently, I am trying to write a User Event server script but it has a very high probability that it will go over the usage limit. I read about nlapiScheduleScript but I have a few questions about passing variables to the script.

I want to load an Item Receipt record and use information from the line items. If I set up an array that contains the record id of the receipt and pass it through the api call to my script, how can I access the array in my script?

I have been looking through the forums but cannot seem to figure it out. On another note, is there any