Themes, background images, and layouts are a good way for you to customize your presentation and tailor it to a particular audience. In this lesson you will learn how you can easily set a custom wallpaper, or use a theme that Google Present offers.
If you want to put your video files online using HTML5 then it's recommended to have three different formats for a full browser support. Those formats are mp4, ogv and webm.
In Google Chrome you can set the pages you want them to open on a startup. The option is a bit hidden that's why a lot of people are having hard time when trying to find it.