This is the release candidate of the next version of QTk. This version of QTk adds migratory user interfaces. Please check the official QTk web page for more information about QTk (see /documentation/mozart-stdlib/wp/qtk/html/index.html). Please note that the URI for this version is not x-oz://system/wp/QTk.ozf as stated in the documentation, but is http://www.info.ucl.ac.be/people/ned/nextqtk/QTk.ozf. Also a bug might appear that crashes the ozengine while loading the QTk.ozf functor. If it is the case, force the loading of the Tk module before loading QTk.