[jcifs] problem with java applet needing NTLM proxy authentication

[André Warnier]

John.Baker at barclayscapital.com wrote:
> I don't think you can get access to the browser's JS session unless you sign the applet.  You could of course pass everything you want as parameters to the applet. 

I do that.  The applet is signed, and that part works fine.  The applet 
does pick up stuff from the input boxes of the html form it's located 
in, through javascript-java interface (I forget what it is formally called).
The applet also accesses the browser's proxy configuration, to figure 
out what proxy it should be going through with its own POSTs. That was 
not intuitive to find out and do, but it also works fine.

The part that I want to find out now however, is how (if possible at 
all) the applet can get access to the (pre-existing) browser's NTLM 
credentials, and how it can use them to set its own credentials for the 
POST it wants to do.
That's where I am stuck and have no clear idea about where to even look.