Excel appear as Powerpoint Slideshow

I have been asked to make Excel appear like a Powerpoint slideshow by using a macro.

Does anybody know a way of doing this? Does anybody know how powerpoint covers the whole screen when you click the slide show button?

I have a way of making it appear to be Powerpoint, but my way only works for certain screen resolutions, which is a pain because the finished version will be distributed to many users.

Any help is very much appreciated.