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When started, the PciSwap device driver looks up the device registry for the HSC device driver specified for its node. If found, the PciSwap driver opens the HSC device and installs its ENUM# handler. Without an ENUM# handler the PCI bus node will not support hot swap. The PCI bus driver init-method looks up the device registry and searches for the instance of the PciSwap driver specified for its device node. If found, the PCI bus driver opens the connection to this instance and installs its handlers for insertion and removal events. The PCI bus node now has hot swap capabilities.