Let's say you ran an action (script) but since there is no output, you don't know when it finished, if it finished successfully etc. That means that you won't know exactly when to tell the user to for example "try again". Aside from that there are Actions (script) I have created that it's only purpose is to provide on the fly information like browser plugins or space consumed in user profiles.

The DEX component has device events and the VDI component has the popup window. The enrich plugin could leverage one of these two options to get the output.