[RockerC]

The way this project works is using Libretro cores inside the retroplayer scaffolding which handles input and display / sound. If there is a MESS core, then yes. I believe there is a MAME libretro core. Otherwise, if you are talking about launching external programs with retroplayer, that is not the purpose of this project. You would want to use a different plugin like advanced launcher.

Sorry but you totally you misunderstood me, and that does not answer what I asked, (follow the links I posted and maybe you better understand what I meant when asking this). What I meant to ask is; HOW well does RetroPlayer (via the libretro API) pass arguments when launch individual game ROMs for a specific computer platform when using a libretro cores like MESS, MAME, UME, and FBA that supports many different computer indside a single core. Please follow this URL and read this: http://www.libretro.com/index.php/mamemessume-cores/

I am not talking about launching other external programs. I already know RetroPlayer uses libretro API and emulator cores for that API. And yes THERE ARE libretro cores for MESS, MAME, and FBA, see link, (so that was not the question asked). This question is only about using RetroPlayer with such libretro cores which support multiple computer platforms on their own.