This is a screenshot of version alpha 5b on Mac OS X. I moved the cursor to \placereferencelist (top window) and started etexshow. Etexshow gives me a context sensitive help.
This is a screenshot of version alpha 5 on Mac OS X. See the \setupclipping description is also displayed in the description buffer.
Here you can see the first version of etexshow in action. In the lower half there is the commands buffer and the description buffer.