Microsoft Windows
Microsoft Windows 2000 and later support sleep at the operating system level (OS-controlled ACPI S4 sleep state) without special drivers from the hardware manufacturer. Windows Vista's Fast Sleep and Resume feature saves the contents of volatile memory to hard disk before entering sleep mode. If power to memory is lost, it will use the hard disk to wake up. The user has the option of hibernating directly if they wish.
Sleep mode is often under-used in business environments as it is difficult to enable post-deployment without resorting to third-party PC power management software This omission by Microsoft has been criticized as having led to a huge waste in energy.
There is a significant market in third-party PC power management software offering features beyond those present in the Windows operating system. Most products offer Active Directory integration and per-user/per-machine settings with the more advanced offering multiple power plans, scheduled power plans, anti-insomnia features and enterprise power usage reporting. Notable vendors include 1E NightWatchman., Data Synergy PowerMAN (Software) and Verdiem SURVEYOR
Read more about this topic: Sleep Mode
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