force slideshow screensaver to read new files

I want to drop a picture into the /users/me/Pictures/SS folder and have the slideshow screensaver find the new picture for its next rotation.

Currently, it seems to do this only if I connect to the machine and restart the screensaver from an interactive session.

I would like to do this via SSH.

I have found that sending signal 1 via the kill command to the /System/Library/Frameworks/ScreenSaver.framework/Versions/A/Resources/ScreenSav erEngine.app/Contents/MacOS/ScreenSaverEngine process doesn't work. I have not found a way to reliably restart the screensaver if I send a 2,3,6 or 15 signal.

Any ideas or pointers?

TIA