SWT Win32 Extension extends the Eclipse library SWT.
It is a software development kit enabling you to work with native code from Java programs without using JNI. With SWT Win32 Extension, you don't need to create native libraries to call a function of the operating system API or a function from any dynamic library. You write code in the Java language only, and SWT Win32 Extension does the rest. SWT Win32 Extension provides quite a number of integration features to make your Java application look and behave like a Win32 citizen.
Window Decorations: making windows always-on-top, transparent, flashing on the taskbar, etc.