One of the previous names of the "Hack and Slash Role-Playing System" from the '90's, was "Mano a Mano". We have changed the name of the H&S RPS back to the "Mano a Mano Role-Playing System." From now on, when we say "Mano a Mano," you'll know we are talking about the paper&pencil side of the project. When we talk about Hack and Slash, you'll know we are talking about the computer game.
Originally, "Mano a Mano" meant "player vs. player" or "playing without a game master."
Hack and Slash uses Mano a Mano based rules.