In this Delphi training guide we look further into Form Docking. In particular we look at the ManualFloat and ManualDock methods to dock and undock forms in code (rather than Drag & Dock). This video is 10 minutes long and you can watch it here.
This book will make you a faster Delphi developer, it doesn't matter if you are just starting out, or have been using Delphi since version 1, you will find all sorts of tips, tricks and hacks to boost your productivity.