asus p4p800 deluxe power upp question

[NiTCOM]

Hi!
I was wondering how can I power up the board with the ps/2 keyboard?
I enabled it and... it states "special key" but which one is it?
With my P4s533 there was a choice of space,crtl-esc and something else !?!

Thanks for the help.

--NITCOM