Is it better to use nlapiYieldScript or nlapiScheduleScript in my situation? I'll explain:

I need to have my script copy values from checkboxes into a multiselect dropdown, for ALL the Contacts in our DB. That's a lot of records. If I run the Saved Search alone, not in the script, it times out. Each time the script runs, it should get a smaller results set, though, because it filters out any records that already have values in the multiselect dropdown.

Also, when nlapiYieldScript-rescheduled scripts resume, do they re-start at the function chosen in the Script Record, or in the exact execution state they were in when they Yielded?