There is a Microsoft Webcast and PowerPoint presentation on this subject which is worth viewing at

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.