Not able to create windows authenticated user in Windows OS

Hi

I installed postgreSQL 8.3 and using it with ArdSDE 9.3.1,But i am not able to create windows authenticated user in my domain like cssl\ranjitc
In SQL server we can create windows authenticated user who will be able to connect to the db server and also from arccatalog by selecting windows autheticated user.

I am new in postgres and plz let me now the whole process what changes we have to make in the pghba.conf file

Plz respond me as soon as possible.....

thanks
ranjit

You can use ldap and sspi type authentication for Active Directory Authentication.

Please follow the link given below for authentication supported:
http://www.enterprisedb.com/docs/en/8.4/pg/auth-pg-hba-conf.html

Thanks for the link

But i am still having doubt ,When i reload the conf file then also i am not able to see the changes made in the .conf file
How to activate it and what is the way to connect to the Postgresql server with the windows authentication.

Shall i need to change any setting while installing postgres...

Please hlp me out ..

Thanks