The Power Manager
Just as Windows Plug and Play features require support from a system's hardware, its power- management capabilities require hardware that complies with the Advanced Configuration and Power Interface (ACPI) specification (available at http://www.teleport.com/∼acpi/spec.htm). As a result of this requirement, the computer's BIOS (Basic Input Output System), the code that runs when the computer turns on, must also conform to the ACPI standard. Most x86 computers manufactured since the end of 1998 are ACPI compliant.
Some computers, especially ones more than few years old, don't comply with the ACPI standard. Instead, they often ...