title: How to implement a login page in a GWT app?
body: <p>My WebApp needs to authenticate user before allowing any sort of access. The scenario I'm trying to implement is a login page with username and password fields. Once user hits "send" button, a sign like "Verifing..." should be shown up while an RPC call verifies credentials. In case of success, load the main app screen.</p>
  
  <p>What is the best way to implement that? </p>