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Diversity is welcome.
I have discovered some risks of having an open anonymous FTP environment on your machine. By 'open', I mean that there are one or more writable directories available for people using anonymous FTP into which files can be uploaded. This arrangement is popular on several of our professors' workstations, as it allows them to exchange files and papers with colleagues at other sites. It is particularly nice for dvi or binary files, which can't be sent directly via e-mail. This hasn't been a problem in the past, but it has become one when escalated by an order of magnitude or two.