REBOL [
    Title: "Check for a File or Directory"
    File:  %ftpcheck.r
    Date:  26-May-1999
    Purpose: {Check for the existence of an FTP file or directory.}
    Category: [ftp net 1] 
]

if exists? ftp://ftp.rebol.com/pub/downloads/ [
    print "Download directory is there"
]

if exists? ftp://ftp.rebol.com/pub/downloads/rebol011.lha [
    print "Archive file is there"
]