network adapters to be explicitly not armed for WoL when shutdown to these states occurs. WOL from a non-hybrid hibernation state (S4) (i.e. when a user explicitly requests hibernation) or a sleep state (S3) is supported. However, some hardware will enable WoL from states that are unsupported by Windows. Mac hardware (OS X) Modern Mac hardware supports WoL functionality when the computer is in a sleep state, but it is not possible to wake up a Mac computer from a powered-off state. The feature is controlled via the OS X System Preferences Energy Saver panel, in the Options tab. Marking the Wake for network access checkbox enables Wake-on-LAN. It can also be configured through the terminal using the pmset womp (wake on magic packet) command. Apple's Apple Remote Desktop client management system can be used to send Wake-on-LAN packets, but there are also freeware and shareware Mac OS X applications available. On Mac OS X Snow Leopard and later, the service is called Wake on Demand or Bonjour Sleep Proxy and is synonymous with the Sleep Proxy Service. It comes enabled out of the box, but in previous versions of the operating system, the service needs to be enabled under the Energy Saver pane of System Preferences. The network interface card may allow the service to function only on Wi‑Fi, only on Ethernet, or both. Linux Wake-on-LAN support may be changed using a subfunction of the ethtool command. Other machine states and LAN wakeup signals In the early days of Wake-on-LAN the situation was relatively simple: a machine was connected to power but switched off, and it was arranged that a special packet be sent to switch the machine on. Since then many options have been added and standards agreed upon. A machine can be in seven power states from S0 (fully on) through S5 (powered down but plugged in) and disconnected from power (G3, Mechanical Off), with names such as "sleep", "standby", and "hibernate". In some reduced-power modes the system state is stored in RAM and the machine can wake up very quickly; in others the state is saved to disk and the motherboard powered down, taking at least several seconds to wake up. The machine can be awakened from a reduced-power state by a variety of signals. The machine's BIOS/UEFI must be set to allow Wake-on-LAN. To allow wakeup from powered-down state S5, wakeup on PME (Power Management