Why does Delphi (dcc32.exe) have an option to set a "Namespace search path"?

Question

The compiler (dcc32.exe) in Delphi 2007 and 2009 has an option

-NS<namespaces> = Namespace search path

Is this releated to the compiler options 'Default namespace' and 'Namespace prefixes' in the project options dialog? Search 'path' sounds like a folder (directory) name, so I am not sure what this option is good for.

Answer 1

It's explained in this article.