[toast0]

Being able to send files between two ftp servers without having to download then upload is a pretty interesting feature that arises from the two connection model of data transfer. Of course, that model also makes ftp hard to secure and hard to NAT.

[littlecranky67]

yepp, FXP. Popular in the warez scene back then, disabled for security reasons everywhere else. You could send arbitrary ASCII data to any remote ASCII based protocol - such as IRC or email. Countermeasures included limiting ports, or disallow download of files you uploaded etc.