I just want to say, great for you that you have all those wonderful products, lovely quote from Samuel Clemens, etc. but when your reply has absolutely nothing useful to the person posting (obviously they are not CAPABLE of upgrading to 10.5, as I am on my bondi blue original iMac) and they are asking a legitimate question - well, as my mother says and taught me well - "If you don't have anything nice to say, better not to say anything at all!" Gianni xo PS that is not said with malice, just an informational message!
Now to the person interested in connecting a 10.3.9 machine to a 10.5.8 or whatever the last digit is machines - it only works from the 10.5 machine to the 10.3 machine, not the other way around. I did not have to do anything special to the 10.3 imac bondi to get this to happen, just connecting by choosing "share screen" under networked list
if this didn't work for you, perhaps you don't have the "screen sharing" or "access to this mac" turned on under sharing? Check and see! Gianni