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a simple experiment on communication via tcp ports
a server runs continously servicing clients. Clients connect, send a message, and
server replies with a message. Message should appear in each separate REPL area
prompt
run server.rkt in a REPL
```
,en server.rkt
(define stop (serve 8080)) ;; starts serve listening at port 8080
(stop) ;; to stop server and free the ports
```
run client.rkt in a separate REPL
```
,en client.rkt
(define stop (client 8080)) ;; starts client talking to server at port 8080
```
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