On Sat, Jan 26, 2008 at 04:51:32PM +1100, Trent W. Buck wrote:
> emacsclient will create a new X frame, EVEN WITHOUT the -c switch.
> 
> I do not want this.  Within M-x shell, I want emacsclient to open a
> buffer in the current frame and window, as it does under Emacs 22.
> 
> ## Why?  Because I'm connecting remotely to a Screen session that was
> ## started under X.  New X frames will appear on the original X
> ## display -- which could be a five hour drive away from the keyboard
> ## and display I'm actually sitting in front of *now*.  Furthermore, X
> ## might not even be running anymore -- my Screen sessions persist
> ## across my X sessions.

Ignore that, PEBCAK.  This does indeed work:

> Invoking emacsclient as "env -u DISPLAY emacsclient foo" does not
> help.

...I had modified the wrong line of my emacsclient wrapper script.