User-engagement oriented UI technology

In the interaction between a user and a PC app
the temporal aspects of the interaction must be well defined.
Existing UI approaches such as WIMP only define spatial and layout related aspects.
We produce a PC-app UI design SDK focused on managing user-engagement.
This SDK consists of a small API and an IDE, both open source (MIT).
It targets wxWidgets, the open-source cross-platform app development toolkit.