After the installer completes its execution (finishes all its installation tasks), the software is ready to be run by the user. Furthermore, the system suitability for the program and the available space on the system may also be checked by the installer. Other common operations such as creating and modifying shared and private system files, creating folders, updating windows registry entries, inserting entries in to configuration files, updating environment variables and creating shortcuts are performed by most of the software installers. Typically the installer may unpack the program files included in some compressed form, copy them to specified paths (folders), make sure that the software is suited to the system hardware, inform the operating system about the newly installed program, etc. If this is the case, the user only has to execute the installer of the program without worrying about anything else. But, because the number and types of files that should be placed for installing varies for each program, most of them come with an installer (which is special program that automates the process of installation). Installation is the process of putting all the files (including drivers, plug-ins, etc.) in the appropriate locations of the computer, so that it could be executed by the user. Installable software applications need to be ‘installed’ on the computer by the user of the software, to make it run. There are even some operating systems such as AmigaOS 4.0 and Mac OS X 1-9 that can be run directly from removable media. Having no formal installation process was the standard on Mac OS X, sometime back. Typically, based on this difference, software applications are categorized as Installable or Portable software. Sometimes, the users can run an application simply by copying the supplied program files to an appropriate folder, but others require the user to install the software by running the automated software installer program first. Depending on the type of software, the user has to perform one or more tasks before being able to run the software application. Developers of software applications deploy their products mostly through media such as CD/DVD or through internet.
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