On the other hand, I used this behaviour to my advantage in the DOS era. I had written a small utility to easily start my games (a Pascal program). My goal was

On the other hand, I used this behaviour to my advantage in the DOS era. I had written a small utility to easily start my games (a Pascal program). My goal was to get as much memory free for the games. To allow unloading my program before launching the game, I wrote a bat script which first launched my program. My program would replace the last line of the script with the game to start (and a goto begining), and then terminate. Now, command.com would start my game, without any memory overhead. When I quit my game, I come back to my utility. At the time, security was not my concern...