How can I find what process is starting apps in the background? I keep seeing CIJScannerRegister running. I'd like it to never run. Every time it appears I use launchctl to remove its listing and that kills the app. But it reappears later. I know where CIJScannerRegister lives and could delete it, but I would rather get whatever is starting it to not start it. I've looked through /System/Library/Launch{Agents,Daemons} and cannot find any matching entry in there. How can I find the process that is launching it and tell it to stop?
CIJScannerRegister is of no use if you don't have an old Canon Inkjet, but Mavericks really wants to have it running all the time.

It's in /Library/Image Capture/Support/LegacyDeviceDiscoveryHelpers, but if you remove it it will appear again in the form of a "Canon Inkjet Printer Software Update" in the App Store.

The only solution I found was to delete the executable inside the app bundle so the OS thinks it's still installed but it can't run.

In Terminal:

killall CIJScannerRegister
cd /Library/Image\ Capture/Support/LegacyDeviceDiscoveryHelpers/CIJScannerRegister.app/Contents/MacOS/
sudo rm CIJScannerRegister