Require your views on web application development

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Hello all experts,

I have puzzled myself into what approach should I take in developing an application for the below mentioned scenario:


OK, the following are the primary requirements.

The application is to be developed for multiple users of a company who has offices in 25 different countries with a total staff of more than 50000 users.

All the countries use different operating systems based on their local availabilities. Most prominent are Windows and MAC machines.

I would have to initially deploy the whole application but every now and then would have to update small parts of application which would require re-compile and therefore re-deployment. I want that all the other parts which are not re-compiled should remain intact and only the part which is re-compiled can be deployed.

Should be able to shut down a part of the application and still all other parts remain intact and working..

Please shed some light on this... any help would be appreciated.

Thanks.