How to refresh Symantec End Point Learned Application database?

Hi,

How to refresh Symantec End Point Application database?
Symantec End Point Learned Application Notification reports a certain unauthorized application (e.g. sniffer) installed on an endpoint but when I checked on particular end point system, I couldn't find that application..
How can we verify that the reported learned app is as per recent scan? or is there a way to rescan the particular system or all systems?

Thanks,
Ray