'Test' Button in revMenubar

[Richmond]

There's a 'Test' button in the revMenubar stack to the right of the 
'Dictionary' button with
a sort of cogwheel icon.

It does not seem to do anything.  A bit sneakily the button is referred 
to as "Deploy" and contains
an extremely uninstructive script:

on mouseUp
    revIDEDeployAction
   pass mouseUp
end mouseUp

I have been unable to locate a function "revIDEDeployAction" in the stack,
the card, or in the custom props of either, and am beginning to wonder 
if it is stored in another stack
that loads at startup, or is just a 'dud' at present.

Richmond.