Exit mupen - gamepad shorcut

[SOLVED]Exit mupen - gamepad shorcut

Hello,
I'm using mupen64plus on htpc, controlled by remote with xbox(1) gamepad - I don't have keyboard connected. I'm using remote to control device, and xbox gamepad for playing games.
Is there a way to set gamepad buttons combination for exit mupen? Every time I start any rom I must connect keyboard to turn mupen off, or I must reset my device.

Regards

ok, I have found this in cfg:
# Joystick event string for stopping the emulator
Joy Mapping Stop =

But I don't know how his string shoud look like.
I have tried several options.
regards

Thank you for answer on wiki and for addressing the subject.

Anyway if someone else have similar problem, please read this wiki - http://emuwiki.com/index.php?title=Mupen64Plus_Core_Parameters