Two computers accessing one external disk with iTunes ?

I have my iTunes music files located on an external firewire disk connected to my iMac.
Can I set up access from a Windows based laptop so that I have in fact two computers accessing the same set of music files?
If so, when I add music from either the Windows laptop or iMac will the other computer 'see' the files or must I do something first?
Message was edited by: Roger Cuthbert

I have Time Machine set up with both an iMac and my MacBook using the same drive. But unlike what Canada Steve is doing I've set the MacBook to look at the hard disk as a network volume so backups can be done at the same time and restoring can be done wirelessly.

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