You might try to enumerate print jobs, or to watch a particular print job in a print queue.

Check VFP code samples (some of them in members area):

How to retrieve number of print jobs that have been queued for the printer
http://www.news2news.com/vfp/?example=367

Simple printer queue monitor: deletes, pauses, resumes print jobs for local printer
http://www.news2news.com/vfp/?example=373

Enumerating print jobs and retrieving information for default printer (JOB_INFO_1 structures)
http://www.news2news.com/vfp/?example=368