Assuming you have children and don't want them to be longer than a specific time connected to the internet. After that time the PC should shut down, or logoff, whatever you want. Onlineeye can do that for you. Just select the maximum time to be online and a "Shutdown Mode".
Poweroff supports the following actions:
Logs off the current logged on user.
Reboots the computer.
Shutdown the computer.
In NT/2000/XP this will display the standard message ‘It is safe to shutdown you computer’.
In Win9x/Me this will poweroff your pc if your hardware supports it
This action will physically power off your computer. Your hardware must support this, for example an ATX motherboard and power supply should support it, but an old AT motherboard probably doesn’t support it. You also have to have ACPI or APM enabled in your bios. And the power options must be correctly configured in the windows control panel. If Windows performs a poweroff when you do a normal windows shutdown from the start menu, then it will also work with this program.
To enable poweroff in Windows NT, you will need a hal.dll that is capable of shutting down your workstation. You can try one that's supplied with service pack 4 (or higher): hal.dll.softex
Just extract the service pack (with the /x option),
There are several machine-specific HAL.DLL’s, and you MUST extract the matching HAL*.DLL.SOFTEX from the service pack. To avoid problems when someone overwrites the good HAL.DLL with a bad one it's better to rename HAL*.DLL.SOFTEX to %SystemRoot%\System32\HALPOWER.DLL for instance, copy the line in %SystemDrive%\BOOT.INI which loads the current system, alter the description and append " /HAL=HALPOWER.DLL". Now one can choose between the two HALs and has a fallback if the new one fails.
If you like NT to automatically poweroff at shutdown, set the following registry key to 1: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion\Winlogon\PowerdownAfterShutdown
If your pc supports it, then this will put your pc into standby mode (sleep mode). If you get a strange error message, then probably one of your device drivers doesn’t support standby. Standby is not supported on NT.
If your pc supports it, then this will put your pc into hibernate mode. If you get a strange error message, then probably one of your device drivers doesn’t support hibernate. You also have to have hibernation enabled in your power settings of the windows control panel (windows 2000 or above). Hibernate is not supported on Windows 95 or NT.
This action will lock your workstation. This is only supported on Windows 2000 or above.
This action allows you to start up a remote pc. This remote pc must support Wake-On-LAN. This means that you have to have a network card that is connected via an extra wire to the motherboard (or power supply) to provide some power. In the system BIOS, Wake-On-LAN must also be enabled.
How it works:
The network card constantly monitors the network for a ‘Magic Packet’ when the computer is switched off. This magic packet is a series of bytes that is sent over the network. A magic packet consists of a header (6*0xFF) and the MAC address of the network adapter repeated several times (16 times), for example if your MAC address is 01:02:03:04:05:06 (6 bytes), then the magic packet looks like this:
The nework adapter recognizes the sequence and triggers the power supply to turn on the computer.