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?

migrated from superuser.com Nov 5 '10 at 8:03

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

  • Good point! I'll have a look! – sunside 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

  • 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. – sunside Nov 4 '10 at 19:33
  • OK : added some more stuff. – harrymc Nov 4 '10 at 20:10

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