Last updated at 8:23 pm UTC on 11 November 2017
An UniClass is a class generated automatically by Squeak which normally just has one instance.
UniClasses are classes for the instance specific behavior of just one instance.
These classes are used in Morphic.
Subclasses of Player are an example.
Uniclasses answer #true for
More see class comment of SmartRefStream and SmartRefStream renaming example