Connecting multiple VB installs via a bridge?

[MetalAges]

I know there are a lot of people who are interested in connecting multiple VB forums to create a network of sorts, allowing users to retain the same login etc. across all the sites. The only solution to this I have seen to date involves a massive amount of hacking of core files.

Would it not be possible to do via some sort of bridge, the way Photopost, VBAdvanced Links etc. work?

I am not skilled enough to know the how/why this would not work but thought by throwing it out there is may spark an idea in some coders heads.

I am about to launch around 5 sister sites to my forum and am just deciding to start them with a zero user base and have people re-sign up. Sucks but I don't want the nightmare of 2 day upgrades because so many core files are hacked apart.

Thoughts?

[TJFweb]

This would be very useful. I've heard people talking about this before, but I'm not sure if an addon has ever been made before.

[MetalAges]

No addons exist, I've exhausted my search for a manageable solution and one doesn't exist (without severe hacking). I saw hints that VB were possibly working on something but that could be 2 months away or 2 years. When I installed Photopost and saw how it utilized the VB user base it made me think why that couldn't be done somehow with multiple VB installs (except on different domains).