Voice Commands to open applications?

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http://forums.androidcentral.com – I am new to the droid world and was fortunate enough to get a Nexus 4. My life will never be the same! I have a few questions.. Is there a way to voice search for apps/applications on the phone? For example; "Google, open camera?" "Open/go to/play Angry Birds" "Turn on flashlight" What is the most effective way to get information from an email or text posted on my calendar? I would love to do it by voice but any advice would be great. I thought I read on a different forum that the Google search bar across the top worked differently than the Google Now (HowTos)