A method in a human machine interface (HMI) control unit for a first vehicular display device and a second vehicular display device , the method comprising: displaying a graphic user element on the first vehicular display device in a first operational mode, wherein in the first operational mode, the first vehicular display device operates as a master vehicular display device relative to the second vehicular display device , and the second vehicular display device operates to provide mirrored feedback relating to action input data from a configurable application input module affecting the graphic user element of the first vehicular display device ; and when a command is received to transition from the first operational mode to a second operational mode, displaying a graphic user element on the second vehicular display device in the second operational mode, wherein in the second operational mode, the second vehicular display device operates as a master vehicular display device relative to the first vehicular display device , and the first vehicular display device operates to provide mirrored feedback relating to subsequent action input data from the configurable application input module affecting the graphic user element of the second vehicular display device ; characterized in that the method further comprises: designating a corresponding first graphic user interface of the configurable application input module for manipulating the graphic user element of the first vehicular display device in the first operational mode; and designating a corresponding second graphic user interface of the configurable application input module for manipulating the graphic user element of the second vehicular display device in the second operational mode. displaying a graphic user element on the first vehicular display device in a first operational mode, wherein in the first operational mode, the first vehicular display device operates as a master vehicular display device relative to the second vehicular display device , and the second vehicular display device operates to provide mirrored feedback relating to action input data from a configurable application input module affecting the graphic user element of the first vehicular display device ; and when a command is received to transition from the first operational mode to a second operational mode, displaying a graphic user element on the second vehicular display device in the second operational mode, wherein in the second operational mode, the second vehicular display device operates as a master vehicular display device relative to the first vehicular display device , and the first vehicular display device operates to provide mirrored feedback relating to subsequent action input data from the configurable application input module affecting the graphic user element of the second vehicular display device ; characterized in that the method further comprises: designating a corresponding first graphic user interface of the configurable application input module for manipulating the graphic user element of the first vehicular display device in the first operational mode; and designating a corresponding second graphic user interface of the configurable application input module for manipulating the graphic user element of the second vehicular display device in the second operational mode. <EOS>