"norton commander" shell had a user defined menu where you could create short scripts, basically just a chain of DOS commands. As a fellow teenager with no Internet access, I've made a "game" submenu which replaced normal autoexec.bat with a slim one curated for a particular game and rebooted computer right into the game. After you exit the game it'll replace autoexec.bat with the backup of normal one and reboot again back into norton commander.

I have no idea why I needed that level of automation, of course.