Windows 7 Wake Timers
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Wake timers are a component of Windows 7 that you can use to wake up a your PC from a power-saving state and perform a routine function.
Prior to Windows 7, users had no control over this, but it's now possible to disable or enable the Wake Timers.
To use Wake Timers you must put your computer into a power-saving state (i.e. sleep), which allows it to quickly resume full-power operation (typically within a few seconds). Putting your computer into this sleep state is somewhat like pausing a DVD player — the computer immediately stops what it’s doing and is ready to start again when you want to resume working.
So for example if you want to run a scheduled security scan at 2 am in the morning you can use the Wake Timers to start the scan while you are peacefully sleeping.
Read More: http://www.qbs-pchelp.co.uk/pchelparticles/windows7waketimers.html
