BIOS is the software that initializes the computer hardware and then boots the operating system.
CMOS in this context means the 128 or 256 bytes of battery-backed up RAM that holds the state that was configured through the BIOS setup menus (or biosconfig).
IPMI is a standard interface used to manage servers. For more information, see the following link:
IPMItool is an open source tool http://ipmitool.sourceforge.net/ used to manage a system. IPMItool is distributed on the Tools and Drivers CD for each Sun platform. You can find documentation (for example, on the IPMItool chassis bootdev command) at: http://ipmitool.sourceforge.net/manpage.html
NVRAM in this context means the portion of the BIOS ROM that holds the BIOS’s boot information.