Call me old-fashioned but the first thing I hit is the Help button and read the manual.
Is it a generational thing?

https://helpandsupport.xara.com/xara..._variants.html
It even covers exceptions:
https://helpandsupport.xara.com/xara...g_objects.html

Acorn

UPDATE
Just worked it out.
I have written or been responsible for a number of Help Manuals, I get annoyed when no one cares to read them.