A port component defines a point on a CODSymbolComponent where you can establish a connection to another symbol. The CODPortComponent class does not have a visual representation. You can use it to define the connection points on a symbol without changing its appearance. Alternatively, you can derive a class from it so the port appears on the screen.

A circle port is derived from CODPortComponent. It is represented by a circle with a cross through it. Symbol Designer uses this symbol to define connection points on your symbols.