How to highlight fields in Crystal Report

HI..I M USING CRYSTAL REPORT TO DISPLAY ONE FILLED APPLICATION FORM,ONCE THE APPLICATION IS FILLED THE DATA IS SAVED IN TABLE AND REPORT IS GENERATED AND IS CONVERTED TO PDF AND SEND TO SUPERVISOR EMAIL ADDRESS...TILL HERE ALL WORKS GOOD,BUT IF THE SUPERVISOR EDITS THE APPLICATION SAME DATA IS UPDATED IN THE TABLE AND REPORT SHOULD BE GENERATED WITH HIGHLIGHTED UPDATED FIELDS IN APPLICATION AND BIENG SEND AS ATTACHMENT TO CLIENTS EMAIL ADDRESS...