It is shift control option f11 to toggle screen curtain on and off.
On May 10, 2014, at 9:32 AM, Eleanor Martha Burke 
<eleanormarthabu...@gmail.com> wrote:

> how do I activate the Mac screen curtain
> 
> Sent from my iPhone
> 
>> On 10 May 2014, at 15:27, Bryan Jones <openses...@me.com> wrote:
>> 
>> Last I heard, the official word from Apple Accessibility was that the IOS 
>> screen curtain has no effect on battery life. BTW, though I’ve done no 
>> official testing, my personal experience leads me to believe this also holds 
>> true for the MacOS screen curtain on Macbooks.
>> 
>> Bryan
>> 
>>> On May 10, 2014, at 9:45 AM, Glenn <glenner...@cableone.net> wrote:
>>> I would think that screen curtain being on would save more battery life, as 
>>> I'm sure that even when it is set to zero, display processes are still 
>>> being 
>>> sent to the screen, and when screen curtain is on, I'm guessing that the 
>>> processes are not calculated by the processor.
>>> Glenn
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