There is a Microsoft Webcast and PowerPoint presentation on this subject which is worth viewing at http://support.microsoft.com/support/webcasts/past_webcasts.asp.
If you wish to see a PowerPoint presentation, and you don't have PowerPoint, you can download a free viewer.
Locate the presentation titled:
Support WebCast: Win95/98/NT Dialup and Authentication using TCP/IP, IPX/SPX, and NetBEUI.
View the Webcast or download the PowerPoint presentation.