Computers which comply to this standard are able to reduce power consumption by switching into the "suspend" state. Besides, they do not have to be switched off manually, but can turn off their own power.
APM is especially useful on laptops. By using APM functions, applications can query the current battery state of the system as well. For example, the &xcenter; has a battery widget that will show you the current energy state of the laptop.
To function correctly,
APM.SYS
device driver
must be installed in the &cfgsys; file.