This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
What exactly do you mean. If you press a "command" button, it most likely will submit the form, and therefore send a request, you can always have your navigation such that it goes back to the same page. Also you can have the Button call be an Ajax call if you want. What is the actual behavior that you want to see?