A receiver-decoder for use in a broadcast system which includes a headend (15) including a headend tagger for applying headend tags to program material being broadcast and a multiplicity of receiver-decoders (40) at user locations, receiving said program material being broadcast, said receiver-decoder (40) comprising: a receiver-decoder tagger for applying receiver-decoder tags to program material received by said receiver-decoder (40); and a user actuated tagger for applying user actuated tags to said program material received by said receiver-decoder (40) in response to user actuation.