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Is there an Erlang shell to evaluate expressions?

There seems to be a sub-window to the right of the module editor, but I'm unable to place the cursor there.

Tried in both Firefox 35 and Chrome 39.

No, there is no shell. Only main() function can be evaluated. You may be interested in http://tryerlang.org/, but it is much more restricted.

I don't understand about which window you are talking about. May you make a screenshot?

I think he might be referring to the 80 column vertical line

That's correct, thanks for pointing it out.