How to share iMac monitor

I have a G3 B/W with a CRT monitor OS 10.3.
I also have a iMac 20” OS 10.4
How can connect both the G3 and imac so that I share the iMac monitor with the G3 CPU? I would like to get rid of the CRT.
If this is possible would I use only one keyboard, or would I still have to use 2 keyboards?
Thanks
Happy 2009

These machines cannot share a display. No iMac—which is a completely integrated computer and display system—can be used in place of the display with another computer.
What you can do is run a 'headless' configuration: one in which your Power Macintosh G4 does not have a display, but is otherwise operable. Using a product like Apple Remote Desktop, you can control that machine from your iMac remotely.
There is a discussion are for ARD located here.

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