Microsoft doesn't explain what the line "user" is for:

http://support.microsoft.com/kb/96269

FTP is capable of using scripts (lists of commands from external files). The following example demonstrates a script that opens a connection to IP address 11.11.11.11, logs on to the host as a guest with the password "guest," uploads the File1 file, and then quits:

open 11.11.11.11
user
guest
guest
put file1
quit