:Window-Styles

Hi all,
Does anyone know where I can find more information about 
the :WINDOW-STYLES initarg ? For instance, the podium 
has 
'(:Hides-On-Deactivate :Borderless :Internal-Borderless
:Ignores-Keyboard-Input :Always-On-Top :Movable-By-Window-Background)
for :wndow-style, and I wonder if there's one to get the narrow top
border with the narrow
buttons (as seen, e.g., in the font menu of Terminal.app when apple-T
is pressed).
The manual didn't turn up anything, nor did a grep in the Library.
Anyone know anything
about this seemingly undocumented feature? If it matters, I'm on LWM Pro 4.4.5

-- 
=====================
Joshua Taylor
tayloj@rpi.edu