None. I never had to use a password. If I ever reloaded the software, it asked me if it was a PATH 1 or 2 and loaded it. But read on.
Therefore if you go to DOS and from the C drive root directory type in PFM.exe followed by ENTER, you should get to a screen where you can view and edit parameters. the only parameter I needed to edit was on the EZPATH2 for spindle gain, parameter 71 (I think). This is adjusted to get the speed asked for and actual to be close.