QTR-Quadtone RIP

Another dumb newbie question....

Ok, from browsing the messages, I see that there is a QTRIP tool for
generating ICC profiles, to use for soft proofing within photoshop (or
other image editing software).  

So, just where does one find this tool?  And what
documentation/instruction/information is available on how best to use it?

And, while I'm at it...  there seems to be a lot more to QTRIP than
what is readily available through the QTRIP-GUI.  Where can I get
documentation on the features of direct access (command line, I
presume) to QTRIP?

Thanks and regards,
Dave Keasey