What I found : The IFS seems an extension of the network redirector, intended to solve some data corruption problems. It did exist in DOS 4 only and was not well documented by Microsoft. The following books offer some information: Schulman "Undocumented DOS", 1991 edition page 217 Podanoffsky "Dissecting DOS", 1994 edition, page 71 ss. Chappell "DOS Internals", 1995 edition, page 500 ss. Also the 1993 edition of RBIL says that offset 3Bh in DOS 4 List of lists points to the first IFS driver, and to some unknownn function in DOs 5.
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