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They may have a computer that is dedicated to their high-resolution overhead projector. The projector could well require special drivers and hardware making it much easier just to use the already setup computer for the presentation. Most Windows computers are already setup to run PowerPoint presentations so they could have simply transferred over the data via a CD-ROM or network connection and run it from there.

A CD-ROM would be the most likely and easy method of moving the presentation around without any hassles. Virtually any machine today has a CD-ROM drive. Sticking the CD into someone else's computer and running a PowerPoint presentation could well leave temporary files of that presentation on that machine.

Not far fetched at all.

I use a USB Memory Key for my Powerpoint presentations. It is about the length of one popsicle stick and the thickness of about three. It holds 32Mb of data and plugs directly into a USB port. If the machine has W2K, XP, or ME then you do not have to load your own drivers. It would take less than minute to unplug it from one machine plug it into another and copy the presentation. Plug it back into the original machine and no-one knows.