How to run dos game with DOSBox -- the RetroArch way

DOS was one of the most popular operating systems for PC prior to
Windows age.  As time goes by, DOS is not compatible installed on
modern PC except for free and open source counterpart like freedos.
DOSBox is the emulator to run DOS applicatioin on moderm operating
systems(e.g. linux, windows, macos or others).

RetroArch makes things more easier.  As a frontend to many emulators
inlcuding dosbox, it provides consistent way to play games built for
various platforms. dosbox becomes a module of it.

With RetroArch, I'm introducing you a quick step-by-step way to run
dos game:

1. download RetroArch
load https://www.retroarch.com/index.php?page=platforms using your
browser.  click save to download and install RetroArch.

2. download DOSBox Core
RetroArch calls a module as 'Core'.  On MAIN MENU screen, select
"Online Updater"->"Core Updater" ->DOS (DOSBox).  you now have a
DOSBox Core

3. load the content (i.e. the game)
put a dos EXE-excutable file to a path you can remember, On MAIN MENU
screen, select "Load Content", then find the dos EXE-excutable on the
path and select it.

These 3 steps will reduce to 2 or 1 when you get familiar with
RetroArch.