the directions are at the wiki page http://wiki.linuxmce.org/index.php/Mame_installation
now a couple of hints that are not there, 5 (not F5) is the add credits, 1 and 2 are the start games. Enjoy!
Rule #1 - Be Patient - Rule #2 - Don't ask when, if you don't contribute - Rule #3 - You have coding skills - LinuxMCE's small brother is available: http://www.agocontrol.com
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