Changing security context of logged on user?

From: bob (anonymous_at_discussions.microsoft.com)
Date: 12/17/03 

Date: Wed, 17 Dec 2003 04:36:08 -0800

Is it possible to change the security context of a logged on user? I know i can call the LogonUSer api to get a security context, but how do i assign this to the logged on user? We have a web based system for users changing their windows NT passwords and after they have done this they loose connection to various network services e.g sql server until they log out and in again. Is there any way arround this?

Thank you