Nothing in particular, with restoring old bikes always looking for modern technology to help with this regular problem where a torch or a hammer [lol]is not an option.
Looks ok in this vid, i work in the oil industry, our plant, parts of it are 40 years old, would be absaloutly no use there as the vid sugests... its a cutting torch or a hydralic nut spliter, might be ok for small nuts on cars and bikes http://www.youtube.com/watch?v=CZNLtMQ329k
Looks to be a similar gas to what we use for pipe freezing - I've never thought to use it in that way before but might try it before going straight for heat the next time I've got a stuck thread.