RE: get current frame size?

[Drew Adams]

>  - You can also calculate the frame parameters at run time using
>  `display-pixel-width', `display-pixel-width'.  But I don't think
>  Emacs knows the sizes of window borders and title bar, so the approach
>  is somewhat limited.  At least can you use the above functions to test
>  on which kind of screen you "are".
> 
>  - Drew Adam's "frame-cmds.el" has additional related stuff.

See also the code in `oneonone.el'.  It uses `(x-display-pixel-width)'
(and `...-height'), called `display-pixel-width' in recent Emacs (both
names work).