Simple seeding question

Hi all,

first off I apologise for asking this question again. I had asked it on the SLAC forums but can’t find it on the CERN forums

I have a modified version of the TestEm7 example which uses GPS as opposed to ParticleGun. However there is no variation in the results. I do remember that the fix was very simple but I can’t find that either. Would somebody be kind enough how to set the seeding in this example?