Advanced Power Management (APM) is an API developed by Intel and Microsoft which allows a BIOS to perform power management, such as reducing the CPU speed, turning off the hard disk or turning off power to the display after a preset period of inactivity in order to conserve electrical power, especially for laptop computers. Monitors supporting such APIs are usually referred to as "green monitors", meaning environmentally friendly.
This is not to be confused with a screensaver which is software that causes the display to go black (by setting every pixel to black) to prevent burn-in.
The suspended state is a special low power condition that applies to your computer as a whole, and not the individual components.
The APM definition of Ready only indicates that your computer or device is fully powered on, it does not differentiate between active and idle conditions.
Because of the architecture of the APM BIOS interface, the APM BIOS cannot inform Windows 2000 that a request is a response to the user pushing a sleep button, to the BIOS sensing that the system is idle, or to the battery running out of power.
The Advanced tab will allow the customer to control the System Tray icon, passwords (which is the same as the screen saver password) and to enable the Wake on Ring setting.
The dialogs for PowerManagement for laptop are similar to those for desktop except for the addition of the Alarms and Battery Meter Tabs.
ACPI has four powermanagement states and are related to each other in terms of power used versus context retained.
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