Where is scheduled shutdown started from?

Where is scheduled shutdown started from?

Hi,
 
We will have planned power outages in several different buildings this weekend. Some of the computers need to be available untill the last moment, so I want to schedule them to be shutdown. So far no problem, however the outage in the building the Desktop Central server is running in is before the others and we don't have our new UPS yet.
 
Therefore my question:
When I schedule a shutdown, where is the schedule saved? Is the command sent to the client right away and then executed from there or does the server send the command at the scheduled time?
 
 
Best regards,
Thomas

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