The first port contacts the server on port 21, but instead of then issuing a PORT command and allowing the server to connect back to its data port, the client will issue the PASV command.

You can multicast events and data from one port or flow port to multiple ports or flow ports.

For wireless data, an ir port was to be built-in, allowing owners of the devices to share data in close proximity to one another through 'beaming' their information between devices.