Also not sure if this is the right list. Probably it is better to do it using just swing without using native code. If you want to use native code you would need to implement the native code in each platform, so you will need to use functions specific to each platform, e.g User32 will not be available in Linux or Mac. In java 6 you already have the getLocationOnScreen() method on MouseEvent, so you just need to get MouseEvent (by adding a mouse listener or mouse motion listener) and call this method. In previous version it might try translating the coordingates returned by the MouseEvent to screen coordinates by using by calling getComponent() to get the component, and call getLocationOnScreen() on the component to get its location and use it to translate the point (this is assuming the component has not moved since the event was generated, otherwise it might get wrong information, but if this is unlikely to happen it might be ok for you) Thanks, Daniel