Distributing an application across Internet

I searched but couldn't find a proper answer for this...may be I didn't look deep enough. Anyways, little insight from you guys will only make things easier. So hear me out.

this is for my final year research project. I just need concepts and if any links I can read more.

So this application is a distributed one for a hotel which has 3 branches (including the main hotel) in location A, B, C. I & (my colleagues) have developed the database, business logic, and 3 separate GUIs for the billing, bar and the kitchen. All are working perfectly and we used .NET remoting for this. this is the whole system and GUIs connected to the business through LAN.

This system, should be deployed in each location (A,B,C) and from the main hotel (A), I should be able to view the details of other locations (B,C). and all 3 systems should be connected through the internet.

problem is, how do I do that?

I just wanna view the information of other places and may be take printouts. that is not relevant for the question i guess.

The database is not distributed, each location has its own database. If I were to use a web service, how can I do it more cost-effectively? where do I have to deploy the service?

as a side note, I have developed a simple chat system (remoting) and tried to connect it through i开发者_C百科nternet with a friend but it didn't work. If anyone knows why?

please be kind enough to provide any other relevant information on this topic. and please ask questions.

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Why not just build a web application with a secure login? That way you build one system, deploy one system, maintain one system. All your data would be in one place, making reporting a lot less onerous, the whole thing would be faster and if you ever need to add a fourth, fifth or twenty seventh additional location, then you'd need to do very little to make it happen.

I see no reason why you have to go about it as you are.