FTP servers often permit anonymous logins. This means users log in as the
'anonymous' user, and don't require a password.
In CompleteFTP anonymous logins are disabled by default, but can be enabled
via the Settings window. The Anonymous Logins section has a checkbox for
Anonymous logins enabled. This should be checked if anonymous logins are
to be permitted.
To prevent malicious users logging in multiple times anonymously, the maximum
number of anonymous logins can also be set. The default is unlimited, but if
anonymous logins are enabled this should be set to a number in keeping with the
site requirements.