A TCP-Dispatch Port is a TCP Port where Configuration and Out Adapter are not previously defined. So this information should be available in the TCP request. See here.
Port type
In this case always TCP - DISPATCH.
Description
A description of the Receive Port.
TCP Port
The number of the TCP Port. This is the actual socket number that should be opened in the firewall to be able to address this Port from the outside world.
Max threads
The maximum number of threads that can be processed concurrently by this TCP Dispatch Port.
DataSet
The DataSet that contains the Local Configuration that should be addressed using this TCP Dispatch Port.
Processed Location
If you use this option, all received requests are copied to this location. You cab leave this empty if you like.