How to wake from sleep programmatically if lid closed?

Question

I want to wake system from sleep programmatically, is there any way to do this?

I have read following link: http://developer.apple.com/mac/library/qa/qa2004/qa1340.h

Answer 1

You can schedule wake up events with IOPMSchedulePowerEvent through the power manager. You may be able to schedule an immediate wake up. pmset is a command line wrapper for the power manager. You can also prevent sleep with IOCancelPowerChange in certain cases.

You may be able to prevent sleep or wake up by generating a mouse or key event. One way to generate events is with CGPostKeyboardEvent.

Edit:

Normal sleep is different from clamshell closed sleep. To affect the latter you must write a kernel extension like Insomnia.