[basex-talk] more than one instance

Hi, I'm currently using BaseX as standard server (java) mode but I planning to switch http://nxdb.codeplex.com/ . (Embedded BaseX port in .Net) My application running as IIS process which has multiple instances and threads. My question is; is there any possible problems to access database at same time by different process/threads ? What happens when trying to access a database that is already open by another BaseX instance ? Thanks in advance, (sorry for poor english) Best regards, Ertan