It would be far to much for me to ask for a full solution. However, could you point me in the right direction in what I need to look up, learn etc as its the first time I am going to attempt something like this.
What I want to do, is in my Mac application, have a list of items which are files which I want to store online. Then from inside the application the user can download any of the items stored at that location online. If I add new items to download online I want the app to automatically add them to the list for download.
That make sense? Anyway, its the first time I have done anything like this using an online server and accessing it via an app, so any support would be hugely appreciated.
Sounds like you want an ftp type server, you can then get list of remote files, upload and download file, if you do search for Cocoa ftp I am sure you will find someone has written a nice wrapper class for ftp, there are even complete open source apps for ftp whose code you can examine, FileZilla, other you could just use NSTask, and call the ftp command line tool on all macs.