ferro, are you clear? if not, here more details
when talking about ftp, you actually need 2 ftp's: ftp server and ftp client
on your server, ie, wamp pc, you need to install ftp server, in which you create ftp users and define everything related to those users such as password, document root, privileges... when setup ftp server, you need to port forward for ftp server in your router, and default port for ftp is 21, then in ftp server, you have to define server(s) and run those server(s) to create users... and to accept access...
on other pc, you need to have ftp client, and the simplest form of ftp client is browser, to connect to ftp server on your server, ie wamp pc; if using borwser you can put in url 'ftp://your_domain_or_ip' or you can even put in user and password in url 'ftp://username:password@your_domain_or_ip'
Have fun,
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