VBScript script progress notification

VBScript script progress notification

I'm a VBScript novice, writing a script that will be parsing large input
file(s) and will likely take several minutes run time to complete
processing. I need a way to alert users that the script is running without
error during this long processing time. My first thought was to present a
msgbox for every 1000th record processed (e.g. "script has successfully
processed 1000 records so far.") Haven't quite cracked the proper way to
code an incrementer that will conditionally trip a msgbox every Nth record
(or determined if there's a better way to achieve my end goal). Any ideas?