Opens the app the user has set as default. So you could make a dot and when you press it, it can open default sms apps. Another dot or icon opens default browser. And so on.
This is a great idea! I was looking for a way to do just that when I find this idea was posted. I've up-voted on it.
I have a Live Wallpaper that I use as a template for the entire family. Although everyone uses the same basic LWP (with different backgrounds, but the same functionality), not everyone uses the same messaging software. This idea would go a long way toward making LWPs more portable.