In a workspace type
Socket newTCP
and inspect it twice - this gives you two inspectors.  move them so
that they are side by side.  In the left one type
self listenOn: 8080
in the bottom evaluation pane and do-it.  Click on 'self' in the
inspector and check that the socket is waiting.
Go the the right hand inspector and type
self connectTo: NetNameResolver localHostAddress port: 8080
and do-it.  If you have both inspectors showing the state of 'self'
then you should immediately see that they have both 'connected'.
In the right hand one then type
self sendData: 'hello'
and do-it.  And in the left one
self receiveData
and print-it.  It should say 'hello'.  You can then do anything you
like in these two inspectors.  You have successfully created a TCP
connection and sent some data.
To then find out what other messages you can send you can either
browse the class directly by alt-b on 'self' or look at its protocol
through alt-p.
rather than using Socket>>listenOn: you could use
Socket>>listenOn:backlogSize: and then inspect
self accept
to get an inspector for each incoming connection.
Some messages that you can send to sockets can block for a reasonable
timeout depending on various things so you can always alt-. to get the
ui back if it seems to freeze.
Before you close the inspectors it is worth doing a
self closeAndDestroy
in each one so that you release the socket's resources.
Cheers
Mike