When you open a CMD.EXE prompt, on a Windows XP SP2 computer, and type powercfg /?, you receive:

                              POWERCFG \[/LIST | /QUERY \[name\] | /CREATE name | /DELETE name |                                     /SETACTIVE name | /CHANGE name settings |                                     /HIBERNATE \{ON|OFF\} | /EXPORT name \[/FILE filename\] |                                     /IMPORT name \[/FILE filename\] | /GLOBALPOWERFLAG \{ON|OFF\} /OPTION flag |                                     /BATTERYALARM \{LOW|CRITICAL\} \[settings\] |                                     /DEVICEQUERY queryflags | /DEVICEENABLEWAKE devicename |                                     /DEVICEDISABLEWAKE devicename | /?\]                              Description:                                  This command line tool enables an administrator to control                                  the power settings on a system.                              Parameter List:                                  /LIST, /L       Lists the names of existing power schemes.                                  /QUERY, /Q      Displays the configuration of the specified power scheme.                                                  If no name is specified, the configuration of the currently                                                  active power scheme is displayed.                                  /CREATE, /C     Creates a power scheme with the specified name.  The new                                                  scheme is created with the properties of the currently                                                  active scheme.                                  /DELETE, /D     Deletes the power scheme with the specified name.                                  /SETACTIVE, /S  Makes the power scheme with the specified name active.                                  /CHANGE, /X     Changes settings of the specified power scheme. Additional                                                  switches specify the changes as follows:                                                      /monitor-timeout-ac                                                       /monitor-timeout-dc                                                       /disk-timeout-ac                                                       /disk-timeout-dc                                                       /standby-timeout-ac                                                       /standby-timeout-dc                                                       /hibernate-timeout-ac                                                       /hibernate-timeout-dc                                                       /processor-throttle-ac                                                       /processor-throttle-dc                                                   AC settings are used when the system is on AC power.                                                  DC settings are used when the system is on battery power.                                                  Setting a timeout to zero will disable the corresponding                                                  timeout feature.  Supported throttle settings are NONE                                                  CONSTANT, DEGRADE, and ADAPTIVE.                                  /EXPORT, /E     Exports the power scheme with the specified name to a                                                  file.  If no filename is specified, the default is                                                  SCHEME.POW.  This additional parameter is supported:                                                      /FILE                                   /IMPORT, /I     Imports the power scheme from a file under the specified                                                  name.  If no filename is specified, the default is                                                  SCHEME.POW.  If a scheme with that name already exists, it                                                  is replaced with the new one.  This additional parameter                                                  is supported:                                                      /FILE                                   /HIBERNATE, /H \{ON|OFF\}  Enables/Disables the hibernate feature.  Hibernate                                                  timeout is not supported on all systems.                                  /NUMERICAL, /N  Allows the power scheme to be operated upon to be specified                                                  using a numerical identifier.  When using this switch, in                                                  place of the name of the power scheme on the command line,                                                  specify its numerical identifier.  This switch may be used                                                  in combination with the /QUERY, /DELETE, /SETACTIVE,                                                  /CHANGE, /EXPORT, and /IMPORT commands.                                  /GLOBALPOWERFLAG, /G \{ON|OFF\}  Turns one of the global power flags on/off.                                                  Valid flags (to be used after "/OPTION ") are:                                                       BATTERYICON:    Turns the battery meter icon in the                                                                       system tray on/off.                                                       MULTIBATTERY:   Turns on/off multiple battery display                                                                       in system Power Meter.                                                       RESUMEPASSWORD: Prompt for password on resuming the                                                                       system.                                                       WAKEONRING:     Turn on/off wake on ring support.                                                       VIDEODIM:       Turn on/off support for dimming video                                                                       display on battery power.                                  /AVAILABLESLEEPSTATES, /A  Reports the sleep states available on the                                                  system.  Attempts to report reasons why sleep states are                                                  unavailable.                                  /BATTERYALARM, /B \{LOW|CRITICAL\}  Configures the battery alarm.  The                                                  following switches can be specified:                                                      /activate                                                           Enables or disables the alarm.                                                      /level                                                           The alarm will be activated when the power level                                                          reaches this percentage.                                                      /text                                                           Turns the text notification on or off.                                                      /sound                                                           Turns the audible notification on or off.                                                      /action                                                           Specifies the action to take when this alarm goes                                                          off.  Not all actions are always available.                                                      /forceaction                                                           Force stand by or shutdown even if a program stops                                                          responding.                                                      /program                                                           Specifies a program to run.  schtasks.exe /change                                                         may be used to configure the program.                                  /DEVICEQUERY  will return a list of devices that meet the                                                  criteria specified in .  Possible values                                                  for  are:                                                  wake_from_S1_supported - return all devices that support                                                           waking the system from a light sleep state.                                                  wake_from_S2_supported - return all devices that support                                                           waking the system from a deeper sleep state.                                                  wake_from_S3_supported - return all devices that support                                                           waking from the deepest sleep state.                                                  wake_from_any - return all devices that support waking                                                           from any sleep state.                                                  S1_supported - list devices supporting light sleep states.                                                  S2_supported - list devices supporting deeper sleep.                                                  S3_supported - list devices supporting deepest sleep.                                                  S4_supported - list devices supporting system hibernation.                                                  wake_programmable - list devices that are user-configurable                                                           to wake the system from a sleep state.                                                  wake_armed - list devices that are currently configured to                                                           wake the system from any sleep state.                                                  all_devices - return all devices present in the system.                                                  all_devices_verbose - return verbose list of devices.                                  /DEVICEENABLEWAKE  enable the device to wake the system from a                                                  sleep state.  is a device retrieved using                                                  the '/DEVICEQUERY wake_programmable' parameter.                                  /DEVICEDISABLEWAKE  disable the device from waking the system                                                  from a sleep state.  is a device retrieved                                                  using the '/DEVICEQUERY wake_armed' parameter.                                  /HELP, /?       Displays information on command-line parameters.                              Examples:                                  POWERCFG /LIST                                  POWERCFG /QUERY scheme                                  POWERCFG /QUERY                                  POWERCFG /CREATE scheme                                  POWERCFG /DELETE scheme                                  POWERCFG /SETACTIVE scheme                                  POWERCFG /CHANGE scheme /monitor-timeout-dc 15                                  POWERCFG /CHANGE scheme /monitor-timeout-dc 0                                  POWERCFG /HIBERNATE on                                  POWERCFG /EXPORT scheme /file file                                  POWERCFG /QUERY number /NUMERICAL                                  POWERCFG /GLOBALPOWERFLAG on /OPTION BATTERYICON                                  POWERCFG /AVAILABLESLEEPSTATES                                  POWERCFG /BATTERYALARM low                                  POWERCFG /BATTERYALARM critical /ACTIVATE on /LEVEL 6 /ACTION hibernate                                  POWERCFG /DEVICEQUERY wake_armed                                  POWERCFG /DEVICEENABLEWAKE "Microsoft USB IntelliMouse Explorer"