Prekon i Syd AB is a design company specialized in IMPACT and prefabricated concrete and steel structures. Here is an IMPACT model I got from them recently.
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In this case the steel was originally modeled in Tekla. and then exported to IMPACT via dwg. All steel parts were saved to the IMPACT database as 'Linked Elements'.
With the help of the steel frame the concrete slabs were modeled in IMPACT,
In the end the complete IMPACT model can be viewed in a free 3D viewer.
By selecting an element you can read the element properties from the database.
The dwf viewer is good tool to distribute and analyze the IMPACT model.