I may not be on your same wavelength (and I have been accused of being on a different planet on occasion), but SQL-Net does refer to the middleware layer that Oracle requires on a client for that client, via Visual FoxPro or ant other ODBC capable program, to "talk with" the Oracle back-end server engine.
Hope this is more than you knew before and gets you headed on the right track.
==Carl
Carl J. WarnerVFUG OfficerThe early bird gets the worm, but the second mouse gets the cheese.