NTLM/Integrated Windows Authentication

We have an IS service exposed as a web service (Provider) and IS is running as a windows service. Web application has to consume that web service(consumer). How do I activate windows or NTLM authentication so that web application doesn’t need to provide username or password when it calls web service.

I found out JCIFS library can do the trick but not sure how. Anyone has any clue?

MWS uses JCIFS for NTLM authentication too.