Is it possible to make a callout from APEX to a SOAP web service that uses NTLM authentication? If so is there documentation and or samples?

I was able to generate an apex class from the WSDL but I don't know how to use it with NTLM auth and I have a funny feeling its not even possible.

NTLM authentication is always getting in my way (unless I'm building in .NET) but I have no say in what authentication protocol is used.