HP INTEGRITY RX3600 - Manual (Page 45)

a locator used to identify a particular PCI/PCI-X/PCIe slot. Activate the locator functionality
using software utilities.
CAUTION: Private core I/O slots one and two on the PCI/PCI-X IOBP and slots 1 - 4 on the
PCI/PCI-X/PCIe IOBP are not hot-pluggable. Do not remove the cards in these slots without first
powering off the server and unplugging the power cords.
Controls, Ports, and LEDs 45