A device receives, from a set-top box andor a user device, usage information associated with video content, and determines a content portal for a particular video content based on the received usage information. Once attached on the support matrix, the resulting monochloro-triazine derivative is reacted with an excess of an amino compound at a higher temperature to achieve high levels of substitution. The border includes a Class \u201cA\u201d upper surface between peripheral outboard and inboard parting lines or lines of flash which provides a high degree of aesthetics to the shelf when viewed from above. For example, this may be achieved by merging competing candidates that relate to the same speech event and that overlap in time into a single candidate, the score of which may be equal to the sum of the scores of the merged candidates. The invention can be used in particular in the field of heterogeneous catalysis.