How can I Identify users on an internal site without requiring credentials?

Currently I am using windows authentication but several of the non technical users seem to have trouble entering their credentials when the browser requests them. The web app needs to be able to identify the users to keep track of their input throughout the site. I was initially thinking cookie but I would need to be able to tell which users entered what and the possibility of them clearing their cookies could cause issues. windows Authentication 开发者_JAVA百科would be great if I could just get around requiring the users to enter their credentials.

On a properly configured network, internet explorer users should not have to enter their credintials. Furthermore, I think all the other browsers have settings to do automatic NTLM authentication (Chrome and Firefox definitely do).

What do you mean "have troup entering their credientials"? How do they log in to their computer?