Embeditor
If you edit a procedure from the Application Tree by going directly to the “source view”:
…then you are looking at the Embeditor
Embed Editor
If you first navigate to the Embed Tree:
… then you will be looking at the Embed Editor:
There are some important differences between these two views. Obviously they present different information but additionally they behave differently in some circumstances. It can be important to know which one you are in!