Philip Davis, instructional librarian at Cornell's Mann Library, describes the Internet to a group of French high school students May 1, while the teen-agers were on the first day of a 10-day exchange visit. The students participate in France's Maison Familiale Rurale (MFR) vocational education system -- similar to 4-H -- in which they gain experience in agriculture and are schooled in subjects such as commerce, childhood education, rural tourism, horticulture, floriculture and equine research. During their stay in the United States, the students were paired with New York state host families involved in the 4-H program.