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You can try setting up screen sharing if the OS supports it. You cannot physically connect the two and turn the eMac into a monitor however.
 
You can try setting up screen sharing if the OS supports it. You cannot physically connect the two and turn the eMac into a monitor however.

Anyone knows how to do this in Tiger? Im currently using teleport to use both at once, but its not the same as 2 screens, more like 2 computers.
 
Screen Recycler does what you want BUT I am not at all sure it works on such old stuff. You could cobble together VNC, but it only mirrors your other desktop, and I assume you want an extended desktop.
 
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