Could someone please explain me how to get a list of the files in a (FTP)directory?

I have set the username and password, and the 'dir_list flag' to 1. But if I send a message like this:

"download ftp://10.0.0.100/Users/Bas/Desktop/Graduation"

nothing happens.

I have no experience with Jitter, but for my graduation project I would like to be able to exchange textfiles from one computer to another through a FTP-server.

Kind regards,

Bas