I checked on my machine and CES_IPCAgent.exe does NOT exist.
I have used PD9 ver 2316 , updated to 2330 and then 2504.
Strange video screen whiteouts and video card lockups with 2504.
Now gone back to Version 2316 for now, suits my system better.
So if CES_IPCAgent ever existed on my machine I must have flushed
it out during clean-up between reinstalls.
Patrick