> I found a DLL called autodisk.dll which exports half a dozen functions and 
> hundreds of COM methods and properties. I found several other DLLs which 
> apparently export... absolutely nothing. (Why do they exist then?)

Just been reading about .net assemblies, these are also saved as .dll files 
but won't expose any "traditional" functions, maybe you found some of these 
too.  BTW the .net assemblies contain type and parameter info in the .dll 
file, so with a suitable tool (or with a few commands from a .net language) 
you can find out what's in there.

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