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I wonder if there's some sort of network packet that announces a computer going to sleep or waking up again.

If not, can you think of reasons why this would be a bad idea?

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2 Answers 2

Try looking into SNMP. There might be a setting for that already.

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Good point! I'll have a look! –  Markus Nov 4 '10 at 19:35

Wake-on-LAN is an Ethernet computer networking standard that allows a computer to be turned on or woken up by a network message.

You can intercept sleep and wakeup events. See the following:
A useful utility - run a program before standby
WMI : Win32_PowerManagementEvent Class

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This is why I am asking - I'm thinking about a way to inform a server (all devices for that matter) that a device has woken up. Otherwise a device might not notice. This could come in handy when it comes to waking up computers that don't support 'wake on unicast' etc. –  Markus Nov 4 '10 at 19:33
    
OK : added some more stuff. –  harrymc Nov 4 '10 at 20:10

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