This looks like a great way to mock up quick strategies and see how they perform without having to dive into language-specific coding(C# or C++).
Does this require any special interface to get Excel to talk with R Trader? Or is just plug n play?
It does not require anything special as a go between. This is all built in directly to R Trader Pro. So this means you would only need R Trader Pro and Excel installed on your machine to take advantage of it.