A cable designed with four connectors on it this is special null modem cable.
It can be used to transfer data.
And is very popular with challenge games across two computers.
Its Dual Head Design allows connections of Virtual All systems.
Not as fast a Parallel but can be left connected at all times.
This Serial Data Tranfer Cable Laplink 4-HEADS 8FT is a great investment for my presentation needs. It works seamlessly and has saved me a lot of time.