Steem SSE is a new version of Steem based on that source release. It incorporates new features and emulation improvements, some of them based on the Hatari  and SainT emulators (this "emulation" goes both ways), some on various internet discussions technical documentation, like chip datasheets, and  tests on real hardware. Steem SSE aims to be the #1 STF/STE emulator. There's no limitation in the original Steem code structure (in C++) that would make that goal unreachable. 'SSE' stands for 'Steven Seagal Edition'. Steven Seagal is a well known Aikido grandmaster, action movie star, musician and playboy. It is rumoured he has a shadowy past working for some secret agencies.  

Mame History will let you know the history of the emulated arcade machine and computer MAME and MESS by. In the file, in addition to a handful of historical facts, there was also room for a powerful dose of interesting facts and anecdotes concerned with the design - the file can be used in practically any tandem mutation MAME / MESS, as well as in their overlays.