Pixel position from window-point?

Hi, OK, I've dug through the emacs-lisp manual and the source code, and I must be either blind or stupid (or both ;-). Given a (visible) point (i.e., "(point)") in a particular window, how does one get the corresponding pixel co-ordinates? Co-ordinates relative to either the window or the frame are welcome. Getting co-ordinates from a mouse event is trivial, but I want to get the co-ordinates of the cursor as I type. I'm writing yet another "mini IntelliSense" mode, and I need to find the rough pixel co-ordinates of the cursor, so that I can pop up a little help window next to it (similar to balloon-help). Thanks, -- Darryl Okahata darrylo(a)soco.agilent.com DISCLAIMER: this message is the author's personal opinion and does not constitute the support, opinion, or policy of Agilent Technologies, or of the little green men that have been following him all day.