"ParcPlace VisualWorks Smalltalk emulates all the supported operating systems GUIs in Smalltalk …
Digitalk (now ParcPlace) Visual Smalltalk uses more of the underlying operating system GUI, for better performance but at the price of only supporting a common subset of GUI controls …
IBM Smalltalk maps the Motif GUI widgets onto the underlying operating system widgets.This means you get a very rich kit to build your GUI, but the widgets operate at near native speed. You have the best of both worlds."
