Help.. I heard Green Screen

[Dakara]

Hi .
I will make video and there will be stykz animations beginning of the video . I wanna make kind of computer virus it will appear right below of the screen and it will eat letter on my word doc.

-- How do I make that things on word screen . I know green screen but I dont know how to do that
--if it is easy to make eating letter effect. how ?
--Or Is there video made before

Thank You ...


Edit : http://www.youtube.com/watch?v=v6b8pkXLypQ they fighting .. How can I make like this ( on word doc. )

[Jess887cp]

That was done with pivot 3, my friend. And a backround sprite. We currently do not have those features.