It is a program that allows you to set different actions for different keys.
For example on my phone 3 presses of the camera button starts cool camera but a press and hold starts the htc camera.
It is in the /New Core OEMs/johnny2678_OEMs/ folder
Look here to fix being stuck in bootloader mode.
http://www.ppcgeeks.com/bricked-phon...ootloader.html