Remoting or Web Services

[Norkis]

Hello,

I need to create server and client software, but I do not know the right way to go.
Communications between applications would be through internet and only server would have reachable IP address.

Main concepts of application working:

Third-part vendor would be responsible of order receiving. After order received, order’s data would be passed to my server application (perhaps, here web services are ideal to use).

Idea of comunication have changed. See next post.

Server should save order in DB and pass it to logged in client (client application). After client is logged in to application, the orders would be passed in.

Steps of order processing:

1. Order received (other vendor)
2. Order passed to server
3. Server passes order to any (randomized) logged in client.
4. If client do not accept order in 15 seconds order is passed to next logged in client. This circle is preceded while the order is not accepted by any client.
5. Response is sent to order receiver after order is accepted by any client.
*. Number of active threads must be limited to logged in clients number. If there are more orders, than clients – order are placed in query.

Hope you understood main requirements of the needed software.

I seek for advice of creating such software. Is it very hard? What technologies and methods to use? When to use web services and when remoting? I must point that security and attainability is comma also.

You advices would very valuable for me.
Regards in advance.

Andrius