By default, as a symbol moves in a dashboard diagram, a link joining two symbols connects to the port closest to the other symbol. A symbol can be designed with special sub-components that can be used as link-in or link-out ports. Links connected to link-in and link-out ports stay bound to these ports as the different symbols move. A link starts from an output port and ends on an input port. The elements are identified as ports thanks to their name: a prefix indicates the type of port.