[mssms] SCCM 2007 to SCCM 2012 moving from Package Model to Application

[Boseman, Marcia H - Raleigh, NC]

We want to take our existing packages from SCCM 2007 and move them to the 
application model in SCCM 2012 so we do not have to carry over all of our 
collections.  Has anyone created a requirement as part of the package model to 
check for the packageID to see if it installed on a machine?  I was thinking of 
using the registry to check this information.  Does anyone have any suggestions?