Dept. of Duh - Deleting a System the Easy Way

Okay I'm not the sharpest tack at times. Using Revit MEP, I was asked how best to delete a system, like a circuit or supply air system. I started to suggest it was easy using the System Browser. One of the students then said, "Why don't you just use the delete key?". Uh...well that works too! It isn't obvious, at least it wasn't to me, but you can select your system and hit the DELETE key, gone it is! You can also activate the Modify Ribbon to click on the Delete button (Red X). It's pretty effective eh?? Here's a VIDEO just in case this text is mumbo jumbo.