This glitche is for the zombie mode in black ops on nintendo ds/dsi. This should work if you do it properly. The only place i have used it in is facility and the temple.
Ok! When you first spawn in the map facility, there is a room with a counch and two windows; the m14 is also in the room. If you run back and forth from the two windows, the zombies will only come out of those two windows. BUT!!! If you leave the room, the glitche will end. A good strategy would be to leave one zombie alive at the end of a level if you need to buy new weapons and etc. Then go back to the room with the couch and windows, and kill the zombie there.
This is where to do the glitche in the map temple. When you first spawn you should see a chainlink fence and two windows, one on each end of the fence. If you stay at one of those windows or run back and forth from both of the windows, the zombies should only come out of those two windows.
Im not sure if you can do this at other windows, but i think the places i mentioned are the best places to do the glitche.