SSO and JSO

In this scenario:

• IE as the Browser

• a Servlet application running on SAP JAVA WEB AS, communicating via JCO with SAP R/3

• SAP R/3 usernames are the same as windows accounts

we want the Servlet application to connect to SAP R/3 with the windows account of the machine hosting the browser, and we don't want the user to enter the windows domain username/password

How can we do this ? Can Kerberos be useful ?

Thx