: You can use DOS emulators like DOSBox or QEMU to run MS-DOS on a modern computer. These emulators allow you to run MS-DOS applications and games on a variety of platforms.

: If you need to extract specific files from an MS-DOS ISO file, you can use 7-Zip or other file archiver software to extract the contents of the ISO file.

Learning DOS commands or networking.

Once you have your ISO file (legitimately or via abandonware archives), here is how to use it.