It’s not always clear what you really mean, may be because of the double translation?
What exactly is hard to understand? You mean the actors? It’s always a very good idea to totally read and understand the manual of each actor. When mixing different vendors it’s not always the same “style” of naming and parameterization. That’s why I personally like MDT very much, as the manual is written in a very understandable way and there are always good usage examples included.
Or do you mean ETS?