Web application and desktop application?

Hi everyone,
I am new to this platform.I have a basic doubts that whats the difference between developing application in flex as a web application and desktop application from programming point of view?Can we use same code in both cases?
Please guide me....
Thanks

Hi and welcome,
The main difference between a web application and a desktop application is that web applications do not have access and can't manipulate your local system ( you can't open a window that displays all your local files, you can't delete, rename, edit local files and so on ). Obviously, this is just one difference, there are many more ( the best would be if you google for "web aplication vs desktop application" because the same rules apply for 99% if not all the platforms you can find out there ).
Desktop applications can have full control of your local system ( obviously, we have to take in consideration the platform we are using because since AIR is quite new in the desktop application field it is also more limited than other languages that have been used successfully to create desktop applications for years and year; like ce C# or C++ and so on ).
Another important difference is that desktop applications usually need to be installed in order to function where on the other hand, web applications can run in the browser without you having to install the aplication you are about to view on your computer ( in some cases, like of the Flash and Flex platforms, you only require a "special player" that can display the content you are trying to access... for Flash and Flex applications you need the Flash Player installed for your browser ).
So, before jumping into a project/platform you need to know your target. If you goal is to offer a fast, easy to access and no install required application to your users then you'll usually go with a web application. If your application needs to work with local files, maybe local databases, or it needs more control over the user's PC and so on, then you'll most likely go with a desktop application.
With kind regards,
Barna Biro

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Thanks for your reply
I post this message to know for general reasons
I know it is very difficult to tell all reasons.
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Tomcat
=============
Apache Tomcat/4.0.1 - HTTP Status 500 - Internal Server Error
message Internal Server Errordescription The server encountered an internal error (Internal Server Error) that prevented it from fulfilling this request.exception java.lang.NullPointerException
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==========================
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