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Hi ,
I found the following information in the site
Apmstat.exe: Advanced Power Management Status :
===============================================
http://www.microsoft.com/resources/documentation/WindowsServ/2003/all/techre
f/en-us/Default.asp?url=/resources/documentation/windowsServ/2003/all/techre
f/en-us/apmstat.asp
Summary :
===========
The control panel includes a Power Options program. If APM is installed
(enabled or disabled) there will be an APM tab in this program. You can
turn APM on and off by selecting the box in this tab. This is the only
recommended and supported way to turn APM off. Turning APM on is Plug and
Play and on the fly, turning it off requires a reboot. If the tab is
absent, the computer is either an ACPI computer or an APM-disabled
computer.
If APM is turned on, there is a Stand by option under Shutdown in the logon
dialog box invoked with CTRL-ALT-DELETE. There might also be a hibernate
entry, but that is not related. (Hibernate can work even if neither APM nor
ACPI are present.) Standby under APM has the same use as under ACPI.
Hope i answered ur query,
Regards,
Venkat.