1. A product for controlling physical properties comprising data processing means with inputs and outputs, wherein said product has approved bounds of behaviour, wherein at least one of said outputs comprises at least one control signal disposed to be output by said product, and said data processing means comprises a processing control means; and a software comprising at least one application, and having a certificate uniquely associated to said at least one application, wherein said processing control means further comprises means for confirming said at least one application by means for verifying said certificate, and means for checking functions of the application and the data processing means in co-operation such that said at least one control signal does not violate the approved bounds of behaviour of the product.