  Basic pairs and their morphisms are the most elementary framework in which
standard topological notions can be defined. We present here a new
interpretation of topological concepts as those which can be communicated
faithfully between the two sides of basic pairs. In particular, we prove that
the subsets which can be communicated faithfully (in the suitable way) are
exactly open subsets and closed subsets. We also prove that a relation (and in
particular a function) between two sets of points can be communicated
faithfully if and only if it is continuous.
