Create CRUD (create, read, update, delete) methods on your server
Request page depending on what you want
I think Unity have something to request WWW page. But remember never trust the client, ALWAYS check client’s data.
WebService (Advance) :
Create a webservice server (ruby, php, c# …)
Create CRUD (create, read, update, delete) methods on your server
Make a communciation between client and server (Xml for example)
Request server from your client
I’m sorry if I don’t really explain how work the non-local game solution but first of all I have to know what his your case. Explain WebService or basic webcommunication is not really easy. In fact, you have to secure, synchronized et check data everytime you request the server.
I’m really sorry for my english but if you don’t understand tell me I will try to explain with other words