After spending a couple of weeks on Openerp again, I tried to change the logic for openerp authentication , via WebClient on Windows 7 Machine with some logic changes in login method of rpc.py file and it worked. Now on clicking Login button Openerp reads my file instaed of database tables to authenticate. Now I would like to implement the same thing with OpenERP GTK Client. I tried hard but failed. So can any one tell me where i can make change.