Simulate mousebutton click?

I want to press a key instead of pressing left mousebutton, How can I do this?.

found the below on wowwiki.com but don't know how to format it and if it's what i'm looking for.

SetBindingClick("KEY", "ButtonName" [,"mouseButton"]) - Set a key binding directly to a Button object. The click sends a mouse down when the key is pressed, and a mouse up when it is released.


Reason I want to know is that I can't get mouseclick broadcasting working with Octopus only mousecursor broadcasting.
So I want to activate my locks 'Rain of Fire' then hover the ground where I want them to put it and click a key instead of leftmouseubutton.