A method for controlling a stand-building process using a sequential step control system , comprising: engaging a first tubular using an elevator ; hoisting the first tubular by raising the elevator ; lowering the first tubular into a spider by lowering the elevator ; engaging the first tubular using the spider ; disengaging the first tubular from the elevator after engaging the first tubular using the spider ; engaging a second tubular using the elevator ; hoisting and lowering the second tubular into engagement with the first tubular ; connecting together the first and second tubulars ; disengaging the spider from the first tubular after connecting together the first and second tubulars , wherein, at all times during the stand-building process, the sequential step control system locks an open/close control of the elevator , or locks an open/close control of the spider , or locks both, depending on a step of the stand-building process being performed; and after completing the stand-building process: hoisting a completed stand from engagement with the spider by raising the elevator , and engaging the completed stand using rig tubular handling equipment ; and automatically disabling an interlock function temporarily and unlocking the open/close control of the elevator to allow opening of the elevator while the spider is open, and locking the open/close control of the elevator and the open/close control of the spider . engaging a first tubular using an elevator ; hoisting the first tubular by raising the elevator ; lowering the first tubular into a spider by lowering the elevator ; engaging the first tubular using the spider ; disengaging the first tubular from the elevator after engaging the first tubular using the spider ; engaging a second tubular using the elevator ; hoisting and lowering the second tubular into engagement with the first tubular ; connecting together the first and second tubulars ; disengaging the spider from the first tubular after connecting together the first and second tubulars , wherein, at all times during the stand-building process, the sequential step control system locks an open/close control of the elevator , or locks an open/close control of the spider , or locks both, depending on a step of the stand-building process being performed; and after completing the stand-building process: hoisting a completed stand from engagement with the spider by raising the elevator , and engaging the completed stand using rig tubular handling equipment ; and automatically disabling an interlock function temporarily and unlocking the open/close control of the elevator to allow opening of the elevator while the spider is open, and locking the open/close control of the elevator and the open/close control of the spider . hoisting a completed stand from engagement with the spider by raising the elevator , and engaging the completed stand using rig tubular handling equipment ; and automatically disabling an interlock function temporarily and unlocking the open/close control of the elevator to allow opening of the elevator while the spider is open, and locking the open/close control of the elevator and the open/close control of the spider . <EOS>