An apparatus receives from a first device a first broadcast messagebeacon which comprises an identifier for an enabling station, then uses the identifier to associate with the enabling station to obtain from it a list of at least one license-exempt channel. The optical processor comprises a pattern in the form of spaced apart regions of different optical properties. The additive can have a dispersant between the silicate plates. During a file access attempt, an identifier of this file will be matched against a set of protected files in a security database. Top support formations lie in a top planar surface of the mat. The process uses a catalyst system which has a supported open architecture indenoindolyl complex.