rhn_register questions

I just started playing around with rhn_register again, and I'm wondering 
why we're bothering to use it while running Current in anonymous mode.  
The only thing it really does which we need is create a SystemID and 
write it to a file.  We should be able to accomplish the same thing by 
writing a fairly trivial script.  Has anyone attempted to do this before?

After poking through the source code, it seems pretty straight forward.  
In registerSystem(), doCall() some parameters to the Current server which 
returns the SystemID.  Does Current return back a unique system id, or is 
it always the same?

--Patrick.