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 (702, 902); disengaging the spider from the first tubular after connecting together the first and second tubulars (702, 902), 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 (702, 902); disengaging the spider from the first tubular after connecting together the first and second tubulars (702, 902), 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.