Hi,
I’ve read about Parallax Mapping and was wondering if I can use zbrush to export such maps (to be used in a real-time demo)?
If you do a little searching on the forum I believe this came up long ago. I believe the success was not quite what was hoped for. The process concerning Zbrush never really took off anyway, perhaps if enough interest exists in the future… 
From what I’ve read and followed Parallax is a process being used, just not with a lot of open support. How you would integrate Zbrush into such a pipeline will probably require a fare amount of testing.
I hope you get somewhere with it and post back here.