ftp servers

I want to see who is logged on to the server here via ftp. the last command does not show this. can someone tell me what i can do to see who is logged in via ftp. thanks. also does anyone know where the vdftp config file is located. i uaully use pureftp for ftp servers but want to check out vsftp an can not seem to find where its config file is located after i install vsftp. thanks jack