I edited the field for gPRF to $0000, and using 7.5.5 cannot see or connect to a 10.5 system. I tossed the application (more like a daemon, there is nothing to indicate it is active aside from the dimmed image of the application) in the Applications folder and tossed an alias in the Startup Items folder.

I think the most reliable way to connecting using anything over 10.4 and Windows will probably require a server software kit.

EDIT:

Warning: Shareway IP Personal Bgnd crashes when attempting to shut down or restart the system (7.5.5). A fix may nor may not come along. Restart holding down the Shift key to disable Startup Items launching, as the program is always open and is only closed by the System shutdown procedure.