Virtual directory??

Jeg er lige ved at skulle installere Pipey's flash chat på min hjemmeside, men det går galt lige fra starten af :-(

"Unzip the files for the chat into a new directory on your webserver. I'll assume for the sake of explanation that you've unzipped them and placed them in a directory called 'chatfiles'.
Create a virtual directory in your webspace. The virtual directory should map to the 'chatfiles' directory you created in the previous step, and should have the virtual path pointing to the directory where you would like visitors to find the chat application. So you might use the virtual path 'chat', which means that the URL of the chat will be http://www.yoursite.com/chat/"
- http://www.pipey.com/chat/installation.asp

Og hvad betyder det så lige?? Nogen der kan forklare mig hvad jeg skal gøre. Gerne sådan så det er lidt forståeligt for sådan en som mig...