This is a simple CGI based file uploader.
If you are behind a firewall, all you need is a browser to transfer files between machines. You don't have to worry about Windows Domains, FTP username/password, NAT etc. Open the location of this repository in your browser, choose your files and select upload.
A browser and a server that supports CGI scripting.
Copy these files to a location in your web server and you are good to go. This should be done well in advance of you needing to transfer files between two machines. When you need to upload a file, access the location in your browser, choose the file to upload and click on the upload button.