SuspendingProcesses demonstrates how to suspend and resume processes using some undocumented API's in the kernel.

CurrentUptime demonstrates how to retrieve the current systems uptime.  This is the actual uptime and not the time since last boot; so it reports correct time even after hibernation.

UserModehardwarePortIO demonstrates of writing directly to hardware ports from usermode to force a machine reset.  The kernel equivalent is RebootThroughKeyboardController.

VirtualMachineDetect demonstrates how to determine if we are executing in a virtual machine (VMware/VirtualPC etc) or a real machine.