There are several styles for the Floating Health Endurance and Power windows that you can choose.
There is nothing shown when the windows are concealed. The windows are invisible with no graphics or controls to minimize the amount of memory used. Nothing will appear on the screen when you attempt to activate the windows.
These are the Ghost style Floating windows.
These are the Graph style Floating windows.
These are the Normal style Floating windows.
These are the Ochi style Floating windows.
These are the Stained style Floating windows.
These are the Viddi style Floating windows.
These are the WOW style Floating windows.
Note: The above images are only sample styles and other variations are available to choose.