Can I send my user back to the previous page when he logins in Drupal ?
He can login from different pages in my website. There is not only one login node. I would like to send him back to the page where he was.
Thanks
Check out the Login Destination module. One of the configuration options for that module is "Return user to where he/she came from. (Preserve destination)", and I believe it's enabled by default.
Also helpful is LoginToboggan, which offers a few more login/registration tweaks. LoginToboggan includes an option for a "Login successful" message, which is good way to make sure your newly logged-in users don't get confused when they get redirected back to the previous page.