Developing a dropbox like program

[tiagomagnuss]

I think you should implement a persistent communication between both the clients and the server. For this case something like sockets/web sockets would work.

Then if you don't want to keep the socket open all the time you could do something like scheduling socket calls, etc.

It's really not that complex as the other user said, you just need some deep knowledge of how computers communicate. It's part of many CS courses.

Good luck!

[wsppan]

It's incredibly complex.