How to create Dockable and floatable forms that can be pinnable and tabbed?

Excuse me if I misunderstand, may be you talking about the MDI - Multi Document Interface.
If I am right:
 - About the Main Form   set the property FormStyle as fsMDIForm
 - About the Child Forms set the property FormStyle as fsMDIChild
emil

looks like this (VC++ component) http://www.codejock.com/products/dockingpane/tour_06.asp 

I just want a simple native code, not buy if possible.
the only feature i want is to snap the form on the side.

another question, how do you make the application remember your last setting?
i mean, if you ran internet application, click show history, close the application.
next time you open the internet application, it remembers and displays 'show history'.
Same goes for menus, if the menu is currently uncheck, next time you open the application, it remembers that you uncheck it or not.

i think i found how to snap it on the side. I guess i have to add a code in the onDrag and set it to snap if x & y coordinates exceeds the parent x & y coordinates.
Now, how do i make the application remember the setting when i close the application?

You can store the x & y coordinates into the Windows registry, or into a .ini file (located usualy into the application path) or into a database table - if your application uses some kind of database....

If you use RxLibrary there is a component TFormStorage into Rx Tools palette....
If you use JEDI VCL (http://jvcl.sourceforge.net) there is a component TJvFormStorage into JvX Tools palette....

The both components are identical by usage and properties:
 if you want to use .ini file:
  - set the property IniFileName as you want to be places;
  - set the property UseRegistry as False (it is the Default value);

 if you want to use Registry:
  - set the property UseRegistry as True.