Recently I produced a powerpoint presentation and added a graph from an excel document. To my horror I realised that by double clicking the chart the user could see the entire worksheet. (Nothing I didn't want them to see, thankfully, but still a big no no)

Firstly: Can they actually see the document if they don't have a local copy? IE, does it attach the full document to the presentation or just references to a local version?

Secondly: How do you turn it on/off? I know I can just create a new document with only the graph but seems like a lot of effort.