First, I need to say I used Windows machines for 25 years. Switched to Mac 2 years ago. For most all of the versions of Windows OS, adding and removing programs, (apps) required more steps than just dragging an app from the Applications folder to the Trash. And I know that some OS X apps have an uninstall feature. But most are just dragged to the Trash. Correct? My concern is that, one of the reasons Windows would slow down or act strange is that fragments and bits and pieces of uninstalled "programs" would linger in files all over the OS. Do I have to be concerned about this with Mac and is there a way to clean out any lingering files if need be?