It`s a very simple windows application but It should be run on a LAN.
Here is what I want to make its a kinda game:
Someone runs the application for the first time,others will join him from their own workstation (they r all on a same LAN) So now they r all running the application at the same time, every one enters a number ,and after they all entered their numbers the application gives the sum of numbers.

DirectX has facilities to develop networking games..

Imo stepping into an advanced API such as Direct X for something so simple is overkill. What you need is to learn how to use sockets well.

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