HTP is controlled via C.Fn II-3, giving you options to Disable (the default) or Enable it. The Canon EOS 1D Mark III's Continuous Shooting modes are accessed via the Drive button, and rated by ...
The EOS-1D Mark IV also offers low and high-range ISO ... an AF cycle can be triggered simultaneously with the configuration being recalled, when C.Fn I-14 is set and the AE Lock button pressed.