What does hdk mean in text?

What are some small devices that solar cells are used to power? Are fingerprints left on things we touch are associated with epidermal ridges? How do waves help in watching television programs? What country has 151 as its international dialing code? How do you use terminal emulator from Android on PC? Why is it important that calls are handled consistently? Is there a common path that advanced civilizations choose for development throughout the universe? Does anyone have kumon answers? What are the best cingullar phones available? When was Kiel Transmission Tower created? What are trust points and how do you use them? How old is the Blackberry Curve 9300? What do you do if you have two bffs that hate each other and when you hang out with one of them the other gets mad? What colour is flint? What is the name of IC 74LS83? How often should you eat chicken? A gaia pin code? What is the past tense of signal? What company used to be called Cingular? What is the icon to access the internet?