Tài liệu the PCI Bus demystified phần 10

Hot Plug places the burden of supporting live insertion on the
platform so that virtually any PCI board is Hot Pluggable. Support
for live insertion includes bus isolation and power switches on the
motherboard for each slot. The operator must notify the system of
his desire to insert or extract a board and wait for confirmation before
taking the action. The Hot Plug Service provides the interface to
the operator while the Hot Plug System Driver controls the platform
resources. A set of Hot Plug primitives defines the essence of an API
between these two elements.