On 04.09.2002, Stephane Ducasse wrote:
>When you have argument you get a popup window for the args

Well, we Squeakers have MorphicWrappers with "argument satellites" 
and message grouping by category.  Haven't filed it in lately though, 
the latest version at <http://minnow.cc.gatech.edu/squeak/354> seems 
to be for 3.2a4586.

HTH, Cheers,
Helge