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ScreenSaverEngine is the Cocoa application that displays screen saver modules at the appropriate times (after so many minutes, when the cursor is in a hot-corner, etc.). It is part of the ScreenSaver system.

If necessary you can run the ScreenSaverEngine from Terminal:

/System/Library/Frameworks/ScreenSaver.framework/Resources/ScreenSaverEngine.app/Contents/MacOS/ScreenSaverEngine

This is useful for running the engine under GDB for easy debugging.

The ScreenSaverEngine supports some special command line flags to aid in debugging:

High Sierra moved the file/folder location: (they also broke the -background flag, on high sierra) Still an active bug as of HighSierra 10.13.4