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There are two main ways that your ASP.NET application might use UNC shares:
Accessing files on UNC shares
For example, your application must access a remote file such as \\remoteserver\share\somefile.dat.
Hosting applications on UNC shares
Your application’s IIS virtual directory is mapped to a remote share, for example, \\remoteserver\appname. In this scenario, HTTP requests are processed by your Web server, but the application’s pages, resources, and private assemblies are located on the remote share.