Hi,

In book: "Access 2002 Desktop Developer's Handbook" by Paul Litwin, Ken Getz, and Mike Gunderloy there is a reference to FoxPro in very good context:

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Rushmore query optimizations
Jet 4 includes support for Rushmore query optimizations. In Jet 1.x, Jet could use only one index for a base table access. Using techniques borrowed from FoxPro, all versions of Jet since 2 have been able to use more than one index to restrict records. Rushmore-based query optimization is used on queries involving restrictions on multiple indexed columns of the following types:
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