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HP's lights-out boards (or Remote Insight Board, RIB) let you take control of a remote server, as though you were physically in front of it. In its basic form, this remote console lets you control the keyboard, mouse and monitor (think of it as somewhat like a virtual KVM). The remote console is implemented as a Java applet on the RIB's web page, which runs on its embedded web server.

The RIBs can be connected to their own power supply. If the host server crashes or is otherwise unresponsive, you can use the remote console to try to fix the problem, or initiate a hard reset or power-cycle to reboot it. You can even power on a server remotely, and view the complete boot-up progress, from BIOS to OS load up.

They are also particularly useful for creating densely packed servers in a datacentre. A RILOE in a server means you won't need to hook up a keyboard, monitor and mouse, nor do you need to hook up one or more KVM switches (which can get messy and complicated). Servers such as these are called 'Headless Servers'.
 
Remote Insight Board, Lights-out Edition (RILOE)
Full-length PCI card, with an embedded web interface
Fast Ethernet port
Full graphical keyboard/mouse console access
Virtual power button, virtual floppy
External power supply
ATi Rage IIc PCI graphics chip with 4MB RAM
Uses an Intel i960 RISC processor at 33 or 66 MHz.
Released in 1999, EoL.