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Hi, The paper http://citeseer.nj.nec.com/jacob99software.html might be of interest for those of you who do direct manip interfaces, as its ideas are very visad-compatible. Basically, expressions like "mouse_down AND some_value < 2" can trigger state changes inside an app-specific state transition diagram. It employs a data-flow network, where "routes", that is, flows of variables thru the network, are activated and deactivated depending on the current state. A simple example: if the above expression yields true, a state change is triggered, that activates a data-flow route from the mouse-position to some variables. I don't know if this is an old hat, but I think it's it very cool. Manuel
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