Sharing external FireWire drive between two Mac Pros

I know that sharing an external FireWire drive between two machines (i.e. both connected at the same time) is a very bad things as both will assume that they have exclusive write access to the drive and quite quickly write over what the other machine has just written.
Would it be possible though to mount the drive as read-only on the first machine and in read-write mode on the second? Would this preserve integrity as the second machine would in fact have exclusive write access or would other problems arise?
Thanks for any responses to a stupid question!
Peter

Mmm, Connect the drive to the private secure network Mac. Connect the two Macs by FireWire and create a network over the firewire connection, configure it to use class C addresses, ie. 169.x.x.x manually and then share the firewire drive to the other Mac (also on a class C network address over firewire).
Both macs will still have their own ethernet network addresses and each network will not be visible from the "other" network (unless you choose to share your internet connection over firewire).
The only caveat here is that the firewire drive will be visible to every other Mac on the secure network that you allow to connect to it (which is why I chose that one, rather than the public Mac). Or can you restrict sharing to only one network ..... didn't think so.

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