Networking.
(Examples from the World prompt.)
A server process:
w> listen: open tcp://:8080
w> port: first listen ; This makes the process wait for a client - see below
w> to string! copy/part port 3
== "ok?"
w> insert port "fine!"
w> close port
w> close listen
A client process:
w> port: open tcp://127.0.0.1:8080
w> insert port "ok?"
w> to string! copy/part port 5
== "fine!"
w> close port