I don't use windows but on Linux it is fairly easy...

• Create new linux system users for each version you want to run,
• Create new postgres users that match (on Linux postgres used ident authorisation by default) the usernames you just created above so you can't accidentally access the wrong databases
• Create separate configuration and startup files to match the versions you want above. In these you set the different port numbers for each system...
• wherever you installed the openerp code, change the ownership of each version to match the Linux user names
• Configure the versions to write to different log files.

HTH

AlAl

Check this: http://www.zbeanztech.com/blog/how-run-multiple-instances-openerp-6-windows

I solved this problem. I just created new login role on PostgreSQL and in openerp-server.conf file changed db_user =NewUserName and db_password =NewPassword. To use databases need to change database ownership to new created user and restart PostgreSQL.

Thank you all for answers.

Thank you all for answers.

You can try it with virtualenv. Here at work with do it with oerpenv (https://launchpad.net/oerpenv) which allows you run different versions of OpenERP in the same machine

You cant run same server for different versions of openerp as its architecture is different. you can try by running different version of openerp server in different ports.