>>>On two installations, one server has an aspnet_client directory created. I would like to know why one server has it and the other not. I would like to know also what has created that and what it is used for?]
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>>That directory contains a few script libraries for client side validation on ASP.Net forms.
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>Is it normal that it puts it in the IIS public structure?

Yeah. I think it does this so that all virtuals can share the files in one place instead of requiring them for each version and then having to synch.

>>Every installation should have this pretty much, so I'm not sure why you don't have it on one install..
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>There might be something different in my local setup.

Well, if ASP.Net is installed it should create this directory. If it's not there it might have gotten deleted maybe by accident.