Simple file server/ Messaging service

Hi, my friend expects a lot from people and while on holiday this week has set me the task of creating a file server. I really don't mind whether it's wired or wireless but I hope to be able to show him that I can save a programme to the "cloud" and copy it back onto another computer (If this is possible) I have semi figured out how to set up a messaging service between multiple computers but wired only so if anyone could give me some pointers or even paste some code in that would be great!

Well, you could serialize messages then send through rednet then de-serialize them on the receiving comp.
use textutils.serialize to serialize stuff

Super cheaty way:
Make a wired network, and connect the computers to a disk drive. Simply stick in a disk and anything written/read to/from the "disk" folder will be saved to the disk and therefore will be accessible to all computers.

Not so cheaty way:
Take a look at the rednet API. You'll need one computer to receive the messages and manage the data, and the rest to send the messages and data.

Cheers Guys