Laurent CHASTEL wrote:
We have now a new office in another country. We have a VPN between the 2 locations but the bandwith is to small. [...]
I would like to have 2 instances of mediawiki on 2 servers, to synchronize them and to allow users to make modification on both instances.
No, you don't. What you want is more bandwidth between the two sites. It will be a lot cheaper than implementing the synchronization.