The Change Sorter is a tool for viewing, manipulating and saving ChangeSets.
To open a Change Sorter, bring up the World menu, select "open...", and then select "simple change sorter" or "dual change sorter".
Suggestion: always choose dual change sorter.
Everything you would want to do in a single change sorter can be done in a dual.
The opposite in not true. No reason to have two tools when one will do. wiz