HOW DO I LOCATE LATEST DEFINITIONS INSTALLED IN MY NISS 2009 PROGRAM?

Hello

            Within the NISS2009 MAIN AREA,  I have tried to find the section where i can check to make sure i have the latest updates for my NISS2009 via identifying the current definitions (version)  offered...  i went to 'history' but  'updates' are listed in the reports...Thanks in advance for your help...Edythe