I recently moved to Elementary OS Luna. I especially use the Synapse Indicator launcher, because I like to work with my keyboard for everything.
In Synapse and in the Synapse Indicator (and I believe, generally, in the Gnome dekstop and I'll dare saying in all Linux DEs) there are "actions". Among actions there is Shut Down, Restart, Lock Screen etc. which can be run with Synapse and probably too from the command line.
I would like to create an action for Turn Off Screen (which is different from Lock Screen).
How can I create this action and be able to launch it from Synapse?