Parallel and serial ports are interfaces for connecting peripherals to the virtual machine. The virtual serial port can connect to a physical serial port or to a file on the host computer. You can also use it to establish a direct connection between two virtual machines or a connection between a virtual machine and an application on the host computer. You can add parallel and serial ports and change the parallel and serial port configuration. With hardware version 11, you can also configure virtual machines in such a way that serial and parallel ports are absent from the virtual chipset altogether.