[I am changing the subject line so that it may be easier to track the
conversation.]
You can see examples of port usage (including an example of tcp) here
on this page:
http://docs.racket-lang.org/guide/ports.html
You'll want to look into getting familiar with the general input and
output functions in Racket before handling network input and output.
See:
http://docs.racket-lang.org/guide/i_o.html
which talks about input and output ports, and the functions that work
on them. To the best of my knowledge, there is no special syntax
involved with ports alone: just learn a few of the common functions
such as read-line, write, and other functions described in the Guide.
About sandboxes: they're a tool to do dynamic evaluation in a context
that limits their resource usage. You can read the documentation
here:
http://docs.racket-lang.org/reference/Sandboxed_Evaluation.html
But for any of that documentation to make sense, you may want to first
read the Guide for the reflection and dynamic evaluation section:
http://docs.racket-lang.org/guide/reflection.html
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