I do not understand what you mean by TWO ftps. Please be specific.
Here is what my Unix Admin has to say..."what happened when the user logs in as anonymous is that the user is restricted to only a certain mount point and not to the rest of the system. then they need to switch users to gain access to there resources. With a standard unix ftp server if a user was allowed to login directly they would have access to the entire system which is a big security risk."