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This paper describes a portable system lo support a new way of visiting cultural and tourist sites. The perspective is that the visitor moves in a physical space like a museum, while seeking information and guidance through the use of a hand-held electronic guide. Techniques are presented to adapt the content of the presentations to the particular visitor, place, and moment of visit (that is, taking into account the user model, knowledge of the physical location and the physical space around it, and the history of previous interactions).