Basic FTP scripting Help

we have an FTP issue.

Stage 1) Client A (in USA) uploads data files to FTP site.

Stage 2) Client B downloads data files .

Stage 3) Client B amends data files and then uploads to FTP site.

Stage 4) Client A then downloads amended data files.


Issues

Stage 1 - Could a notifyreceipt be sent when Client A uploads the data files.

Stage 3 - Data files need to be associated to a date.

Stage 4 - Client A need to Archive old files.

Any help would be really appreciated


Ash