Everything can be seen in this video:
http://www.youtube.com/watch?v=_q0tkaQmfb0
Basically you fill up your fuel and your ore spot and the hopper puts everything in the output since that's the only available spot.
Taking it out gives XP.
MC-6135
XP Glitch using furnace and hopper
Resolved
Duplicate
0
Duplicate of MC-5748 , please use the search function to see if your bug has already been submitted. Currently over 40% of tickets are being closed as duplicate.