Why ‘only some’ apps are portable?

    “Portable” programs are designed to run on a computer without installing in a way to modify the system’s configuration information. What is this configuration information? What does it contain?  Configuration information or config files which configure the initial settings for computer programs and helps in system function and performance.
    A portable application doesn’t leave and store its files or settings on a host computer; instead, stores program’s configuration information in the program’s directory. Portable applications can be moved from one computer system to another using a portable drive with a assurance of preserving settings.
   The counterpart of portable programs are what are known as “installed” programs. They create files and configure settings  of configuration files. The installed programs cannot be moved between computer systems, they have to be individually installed and configured each time.

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