title: Why gen_tcp is not defined in Erlang shell?
body: <p>After I type <code>gen_</code> and then type a Tab in erlang shell, I get <code>gen_server</code>, <code>gen_event</code>, but I don't get a <code>gen_tcp</code>. How can I use <code>gen_tcp</code> in Erlang shell?</p>