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There was a post a few days ago about superimposing images and what software
to use. It can be done with Photo Studio (Arcsoft) very easily. The only
requirement is that the images have to me the same size.

But some cameras can also do multiple exposures. Check your manual. If you
have this feature then you may not need to buy any software. While there is
less control than doing it with software, it may suit your needs to just do
it with the camera. One thing you should note is that you probably will want
to underexpose each image since they will be "stacked" on one frame like
they were with film.

Bill