Polling - All Ideas Welcome

Here's the deal...

What would be the best way/methods to develope an applicaion to fit the following requirement?

40+ remote locations that produce a weekly file every Sunday. Each location has ISDN and runs on an NT platform.
Each file needs to be transmitted from the remote loation to centre, this can be either driven by centre or the remote locations.

Basicaly the files need to be 'polled' (If that's the correct word) weekly.

Any one got any ideas where to start or if there is software available to do this task?

Thanks in advance.

I'm sure there are commercial products. I can suggest and put you intouch with someone from Level 8. I'm sure there is something in the Geneva suite that could do this.

"Don't use a cannon to kill a grasshopper"

You could do this with a shell script. Can you use MS File Sharing or FTP? If not, then you need to create an app that will transfer over some proprietary (secure) socket.