The Interaction Layer implements the functionality of the Vector specification. This specification describes the detailed features regarding the transmission, reception of CAN-messages, the display of asynchronous events, as well as the description of signal oriented data interfaces for the application in which the data consistency is guaranteed. Functions, respectively macros are provided by the Generation Tool, which allow symbolical access to the signal information within the messages.Their names are derived from the CAN-database. Therefore, a change in the CAN- database does not require a modification in the application code. It is sufficient to start the generation process again, and to compile and link the whole programm code once more. Only applications which really have to process new information have to be modified.The normal handling of the CAN-messages is adopted by the Vector CAN-Driver. Therefore the Generation Tool as well as the Vector CAN-Driver is required for the use of the Interaction Layer.