Where exactly is this Poser.ini file located?

It doesn't seem to be showing up in any searches. Is it actually called that?

And how do I change these settings?

I didn't have this problem (obviously) when Poser Pro 2010 was installed on another computer, nor when I've also had Poser 8 installed at the same time as Poser Pro 2012. Both PP2012 and P8 run independently of each other.

This problem only seems to be with PP2010 when on the same computer as PP2012. Why would they use the same port number for the libraries?

Thanks.