Separate session timeouts for individual users



I have an ASP.NET web application that is written using Visual Basic 2005 web
forms. Currently the session timeout setting is set for 20 minutes in the
web.config file. However, I have a request to have one set of users have a
timeout setting of 20 minutes, with another group having a timeout setting of
60 minutes. Does anyone know how I can create separate session timeout
settings for different sets of users?

Thanks!
.