This script is an ASP.NET version of our classic ASP Server.Execute sample. Not much has changed from the classic ASP version so if you're looking for a description you should probably read that page: Server.Execute classic ASP sample.
Here's a zip file of the code (859 Bytes).
Play with the running version.
View the live source code.
View live source code of the server_target.aspx file.
Back to the "Server.Execute" sample