If you see this is a monitor that checks on hardware on your server. This is how it is described:
hald is a daemon that maintains a database of the devices connected to the system system in real-time. The daemon connects to the D-Bus system message bus to provide an API that applications can use to discover, monitor and invoke operations on devices. For more information about both the big picture and specific API details, refer to the HAL spec which can be found in /usr/share/doc/hal-0.5.14/spec/hal-spec.html depending on the distribution.
If it is creating load on your sever you can stop by issuing this command