How to sync iTunes libraries on multiple machines without copying music

Background:
I have 4 machines running iTunes 9, all authorized with the same account. All music is on a networked storage device (NSA). Each iTunes points to the NSA for music files. Each user on each machine has their own local iTunes library for individualized playlists, etc. When music is purchased, regardless of machine, it is automatically downloaded onto the NSA. We have deselected the Advanced preference "Copy files to iTunes Media folder when adding to library". Our goal is to have one live copy of our music rather than multiple copies sprinkled about all 4 machines. We do periodic backups of the NSA.
Question:
How do I get all the iTunes user libraries on all 4 machines to automatically reflect new music purchases? The library of the purchaser is updated just fine, but no one else's is. The Home Sharing Settings option updates the library, but it also copies over the music, defeating the purpose of one copy.
Thanks in advance!

When I first moved to OS X I decided that all of my/our music should be in one library, with one Apple ID for purchasing/playback and iPod syncing, located someplace other than each user's home folder. Using an alias of the destination folder worked as long as we were all on one machine.
Later when we acquired a second machine the setup was similar, except that the library was on an external HD attached to the newer/faster machine and accessed over our home network. The drawback of this method is that the machine with the library on it has to be up and running (of course).
We've finally moved further into the digital world by purchasing a network drive (NAS to be precise - a My Book World II for those who wish to know), upgraded our router and network switch to GB, and have a third iMac on its way (thank you eBay).
All of our music (the library we started years ago), all of our pictures, and other miscellaneous things reside on the NAS, which is also used for TimeMachine backups (on the non public volume). The idea being that any of us can access any of the media or documents as we need or want to.
Apparently (or I've missed something simple) Apple, in their wisdom, doesn't believe that a setup like ours (and apparently others as well) should exist. That each user and/or each machine, should have their/its very own music library that no one else can have FULL access to.
Home Sharing doesn't allow what I/we've been setting up from the first day we added music to our library. Sure it lets everyone with their own library to listen to other's library's that are up and running (i.e. the machine is on, and iTunes is running).
What we want to do is have all of our machines (the two, soon to be three, iMac's and one PC running XP) access the *same library* with full read/write/burn access AT THE SAME TIME! Hence the logic in purchasing a NAS. What we can't do is have iTunes running on more than ONE machine at a time since the other network users/machines receive this message:
The iTunes Library file is locked, on a locked disk, or you do not have write permission for this file.
Which is certainly not the case since each user/machine can access, read, write, and burn from the above library at will as long as they are the only person doing so.
Changing the permissions on the library file doesn't stick (probably because its on the NAS), otherwise I would have done that and you wouldn't be reading this.
Thanks for any help anyone can give.

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