FE = front end. In this case, your front end software.
Oh yeah, I knew that

<sarcasm>
Can you also add a rotation scheme which is based on the GAME orientation? So when a game is launched in MAME with one of the autorol/autoror parameters, when you return to the FE, the FE changes its orientation to whatever the last game was. I tried explaning this before in the software forum in this http://forum.arcadecontrols.com/index.php?topic=42355.msg388639#msg388639 post.
Here is what we think:
From a real world scenario, if you were using a 3 or even 4 sided you cocktail you are going to do the following:
Sit at the side of the table you feel like using, rotate the FE so that it faces you correctly, browse and launch games.
What we don't think is practical is the following:
Sit at the table, choose a game, launch a game, move to another seat, play a game, and then move back the correctly oriented FE seat.
FYI:
Check out the video 3 threads up if you missed it.
The FE tells gives you game details like, the name, genre, manufacter, orientation, players, controls, times played, last played date and time.