An Ipe presentation is an Ipe PDF document that is presented using, for instance, Acrobat Reader and a video projector. Ipe has a number of features that make it easier to make such presentations.
You may want to have a look at IpePresenter, written by Dmitriy Morozov. IpePresenter shows the current slide in one window (which you can make full screen on the external display), while showing the current slide, the next slide, notes for the current page, as well as a timer on your own display.
The Ipe binary package for Windows already includes IpePresenter.