if you have terminal emulation software eg. Reflections for Unix then you get an FTP Client which is a windows gui interface and makes ftp between NT, Windows(all versions), DOS, Unix to Unix etc very simple. You would simply map to the NT pc from your own machine , then in the terminal emulator you would choose the mapped drive on the left side of your screen - on the right side of your screen it provides a logon to the Unix machine - then the ftp is a simple as click click.
On the other hand, you could put the ip address and host name of the NT pc onto your Unix box in the /etc/hosts file. Then use a script something like this :-
ftp -in ntpcname <<!
user username password
bin
mput filenametobeftped*
bye
!
where :-
ntpcname - is the name of your nt pc
username is a valid user name on your nt pc
password is the password of that user
filenametobeftped* is the name of the file/s to be ftp's ( obviously it would be mget if the files are going the other way).
This will put the files into your default ftp directory on your nt pc (if you don't know where this is - try one file and see where it goes by searching on the nt)
If you're doing this from Unix and want to get the files from NT then you should be in the directory that you want the files to go to.
Ensure that you chmod the script file so that it is execuatable (eg. chmod 777 scriptfilename).
GOOD LUCK