A Net::FTP object is a blessed typeglob. So that $ftp object is a blessed glob; when you see something like this: 
    ${*$ftp}{'net_ftp_host'}

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that dereferences the typeglob, then accesses the hash portion of the glob.

There's a (better :) discussion of this in Advanced Perl Programming.

In reply to Re: Please explain ${*$ftp}{'net_ftp_host'} = $host; # Remote hostname by btrott
in thread Please explain ${*$ftp}{'net_ftp_host'} = $host; # Remote hostname by Anonymous Monk

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