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Macintosh: Uninstall a program

tjie asked

1) This is related to the Mac OS X Lion
2) I have installed a program called "program A"
3) I want to uninstall it
4) I am used to with the Microsoft windows environment
- To Uninstall the program, i usually go to Add/Rem Program
5) How to uninstall this Program A?
6) Thank you

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Most Mac OS X applications (anything that ends in .app), like Safari and iTunes, are bundles. The application icon you see in Finder (typically the Applications Folder) is usually a special folder itself, made to appear as a single double-clickable file. These "folders" contain all, or at least most, of the files needed to run the application, ie they are self-contained. This means that to uninstall these applications, you only have to drag them to the Trash. If you control-click (or right-click) on an Application icon, and you see "Show Package Contents", then it is a bundle.


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Although OSX applications are a lot more compact than their Windows equivalent Amit is not 100% correct.
In OSX the application file (usually ending in .app and located in the Applications folder) can simply be placed in the Trash and deleted to remove.
However most OSX Applications store a number of additional files on your computer.  They are NOT critical but they can contain information such as usernames, activity history etc.  
Applications such as Micrtosoft Office or Adobe applications store files in folders all over your computer and can involve quite a bit of work to remove completely althiough some programs like these come with an UNISNSTALLER application.
If you want to remove an Application and ALL files (and there is not an Uninstaller app) you should also look for files in the User/Library/Preferences and User/Library/Application Support/ folders

There are some utilities that make deleting all the files easier .. you drag and drop the application onto these utilities and they attempt to locate all the related files and let you choose to delete them too. ..
AppCleaner - http://www.macupdate.com/app/mac/25276/appcleaner - Free

I also use  CleanApp - http://www.macupdate.com/app/mac/21453/cleanapp as it has a number of other system cleanup features but it costs a few $$