Is it possible to create an OS that can run all application?
Just a thought, if we have to make our application cross-platform, then is it possible to create a cross-application OS?
Technically yes as long as you limit the scope of all to all applications that run on major OSes. It is theoretically possible to create an OS that could handle applications run on the 4-5 most common OSes but the amount of work involved would be monumental. Every time a new feature was added to any of the OSes, you'd need to add it to your OS too - So as well as being almost impossible to build, you'd need a large enough dev team to stay ahead of 4-5 of the largest dev teams/groups in the world.
No. Lets say you do go and invest - a monumental amount of - effort in building you're Uber-OS (that will run Mac apps, Linux apps, Unix apps, Android apps, i-phone apps, Nokia apps, Symbian apps, SAP apps, Windows Apps etc). Then there's nothing stopping someone writing a new OS that you don't support. P.S. And there are hundreds (if not thousands) of different hand held devices out there for scanning products, weights and mesures etc many of which have their own flavour of OS.
No but with virtualization you could have a single computer that can run any application.
First there is the practical impossibility of successfully following the evolution of an indefinite number of operating systems. Do we take embedded OS into account? How about one-shot OS for specific applications? How about proprietary OS with no access to documentation? Then there is also the - very difficult, if not impossible - problem of merging the various paradigms used in the wild. Ideally you would want OS services like the clipboard, or networking or ... or ... to work in a uniform way and allow applications to cooperate as if targeted to the same OS. (Let's not even think about the various hardware-dependent applications.) After all this, you should also consider what the application development for your own OS would be like... I wonder if this is a good case for Gödel's incompleteness theorems :-) PS: That said, there are quite a few projects attempting to bridge the various OS gaps: http://en.wikipedia.org/wiki/List_of_computer_system_emulators http://en.wikipedia.org/wiki/List_of_emulators#Operating_System_emulators
What you can do is use virtual machines, such as VMWare's software, and emulate several operating systems on the same physical machine.
What do you define by an operating system that can run all applications? Applications are mostly written in a higher level language and then translated into binary code that differs between machine architectures (like Intel and PowerPC) and operating systems (like Windows or Unix-based systems). Java for example is only cross-platform because not the language itself is cross-platform (any high level language is), but because there exist Java virtual machines for different architectures and operating systems that abstract the heterogeneity of the underlying system. It is definitely not theoretically impossible (nothing is except for some mathematical problems), but can you imagine what one would have to do in order to make such a thing work? You can basically run Linux programs in Windows with CygWin, you can also run Windows programs in Linux with Wine. All of those try to create a small operating system (e.g. the Windows core) into your other OS (e.g. Linux). This is probably not what you want. To summarize, I can't imagine anyone really trying to do that. With all the money in the world, seriously. Better invest in writing native apps for the operating systems you want to support.
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