The Focus Spec states:
<<The request will also be denied if the Component's top-level Window is not the focused Window and the platform does not support requesting focus across Windows. If the request is denied for this reason, the request is remembered and will be granted when the Window is later focused by the user. Otherwise, the focus change request changes the focused Window as well. Currently, Microsoft Windows supports cross-Window focus transfers while Solaris does not.>>
But MS Windows no longer allows cross-window focus transfer. According to the MSDN
only Windows 95/NT provided this ability.
As to Solaris, it also depends on WM it uses. I would remove any mentioning of native
platforms here at all.