When web applications are pushed to CloudFoundry they are pushed out to one or more Windows cells and run inside the Hostable Web Core (HWC). HWC is the same component that IIS uses underneath to do the heavy lifting of serving ASP.NET applications. In Cloud Foundry the HWC is bootstrapped by the command line hwc.exe which works much like IISExpress.
We're going to serve the PCF .NET Environment Viewer app locally using the hwc.exe. These steps will guide you through all the prereqs to get that app working.