WPF, formerly code-named 'Avalon', is the official platform for rendering XAML documents on a WinFX-enabled machine. WPF is referred to as one of the 'four pillars of Vista', and is a component of the WinFX API.

Water producing facility. Any device or method, mechanical or otherwise, used for the production of water from the groundwater supplies within the District; a water well.

Windows Presentation Foundation