question on ftp - drag and drop

[David Banning]

I am interested in setting up my ftp server so that users can login
to their directories and drag files from one sub-directory into another.

I am now using ProFTPd. Users are permitted to login to their directories
using the ftp built into IE, and drag files onto their desktop and back 
again. They can create files and erase files on the ftp server.

I have not figured out how, or if it is possible to cut and paste files
from one sub-directory to another. Using IE remotely through ftp
you can cut a file, but once in another directory the paste is not
available.

Where I am going with this is that sales people want to save and access
each other's word and excel files on the server from a laptop, over the net.