> 3. John would need a little widget that he can carry around. The widget
> contains his presentation. At the client's site he's (as almost always)
> given a permission to use the semi-public laptop and projector. He
> connects the widget into laptop and the presentation starts right away.
> He can now disconnect the widget and remotely change slides with it.
> When he's done, he presses the "done" button in the widget and the
> laptop is like it was before his visit.
I checked if that was already invented. It was! It's protected by three
US patents, others pending.
"RemotePoint Global Presenter"
"Interlink Electronics will unveil its new RemotePoint Presenter, a $199
remote with slideshow controls, a laser pointer and a remote mouse.
Best of all, its receiver unit, which plugs into a USB port, has 32MB of
storage, letting you save a PowerPoint file..."