The documentation states: “netWindows is a DHTML toolkit that aides in the construction of web applictions. The toolkit provides widgets which comprise the building blocs of an application interface and the core framework exposes mechansisms for developers to build their own widgets easily”. Check it out at http://netwindows.org.
Send some feedback or comments if you make use of it and let others know how it functions. I suggest looking at the documentation, then then FAQ document, to get an overview of how the product can be implemented.