[whpalmer4]

Are you talking about the automatic email->action processing? You just need to type enough of the name to make it unambiguous which one you mean.

If you have contexts named "Calls" and "Car", for example, "@car" would get you the Car context, "@cal" would be sufficient to get you the Calls context. It appears from a quick experiment that if you have an ambiguous match ("@ca" above, for example), it will take the first match as you scan down the sidebar, but I would hesitate to rely on that behavior.