Star Wars Galactic battlegrounds saga units in AOEIIDE

I have been playing a lot of SWGBS. Just until today I saw a video showing some of the SWGBS units fighting against AOEII units in DE. I know both games use the genie engine. I am wondering how can I do this. If it requires the Advanced Genie Editor. Is there a manual or somewhere I can learn the A.G.E. tool?