I believe a new ccSvcHst.exe process is started that connects to LU and gets updates. It will be in addition to the ccSvcHst.exe process that is already running.
Virus defs are located here:
C:\ProgramData\Symantec\Symantec Endpoint Protection\12.1.4013.4013.105\Data\Definitions\VirusDefs
You can check for latest folder name
Or why don't you just run the symhelp tool remotely, it will tell you. You can push it to the remote machine and have it run silently than collect the data