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    <blockquote> <p>Should the GUI be separated from the application's logic?</p> </blockquote> <p>It should, because the UI widgets are just types of objects and one of the rules of OO says that each object should be trusted with the responsabilities that it can fulfill. A dialog doesn't know much about serialization for example.</p> <blockquote> <p>If it is separated, how should the logic and the GUI communicate? Are TCP/IP sockets a good option? What are other possibilities?</p> </blockquote> <p>It depends on how much separation you need. I use asynchronous messages for communication, and then I can use different transport layers without many changes. TCP/IP would allow you to use the GUI on a separate machine from the core, but it has higher overhead than passing around window messages for example.</p> <blockquote> <p>Is it a good idea to have the GUI in a language different than a C++? If yes - which language?</p> </blockquote> <p>Ideally, you should use as few languages as possible unless you really need the technical capabilities of a certain language. GUIs are more of a library problem than a language problem, so if you can find a very good C++ UI library (hint: Qt), you should code all your program in C++.</p> <blockquote> <p>Is it a good idea to have a browser-based GUI?</p> </blockquote> <p>It could be, but you should think about requirements and not ideas. Do your customers want to interact with your program from a browser? Can they afford the extra costs and development time? Do you have the know-how?</p> <blockquote> <p>Even though the project's core logic is cross-platform, I can decide that the GUI will be only Windows-based (.NET?) and it will communicate with the logic on the relevant Win/Linux machine through Socket or similar method. Is it a good idea to do so?</p> </blockquote> <p>It could be a good idea, but see the answer to #3. Also consider that you're going to work on a client-server program, which is significantly more complicated than a stand-alone program. Finally, you need to examine the pros and cons of a .NET dependency over using a C++ UI library: what .NET brings you that you couldn't get with wxWdigets, Qt, gtkmm, etc.</p>
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    1. POHow to write a GUI for a large cross-platform C++ project?
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