Thomas Mahaffey, Jr. Business Library
L001D Mendoza College of Business
University of Notre Dame
Notre Dame, IN 46556
Pseudocode showing what you can use preserve and restore for.
*Open dataset
*Do some stuff on it -- call data as they look now "Version 1"
preserve
*Make more changes to data
*Save current version of data in separate file
restore
*Return to Version 1