An NC apparatus controls a position of a tool by driving a plurality of shafts with a plurality of servomotors. The method includes removing the original humeral head and shaping the proximal end of the humerus with one or more implements to prepare the humerus to receive the shoulder prosthesis. The bleed valve also comprises at least one vane spanning the outlet port and having a first side and a second side, the first side being closer to the inlet port than the second side. The system reaction may be to offload future calls to a peer remote computing environment to service future calls. When changes are made to the parent page, the changes are also implemented in any corresponding variant pages.