I have found that when a user's name and password matches the company's active directory windows username and password that they log on with it does not require a login but automatically logs them in. However if the user is either on a computer not part of the domain or is logged on as a user not added to productpoint it will require a login.
What is the purpose of forcing a login everytime other than having a superuser account? If that is the case, have an admin login to windows for that user on their windows client that will map to the admin user in productpoint for active driectory integration. There are other methods of logging in as well, you can have only local user accounts and not tie into an active directory solution but that is going to cause a secondary password management so it may not be a good solution for you. There are a couple of other options but it is more sharepoint based and less productpoint based, I attached the authentication options screenshot.
Chris Olson
Enser Corp
