Custom Class variables

I have created the following in my postgres.conf file

custom_variable_classes = 'iss'

In a SQL session I've tried

Set iss.one = '1'
set iss.two = '2'

Select * from iss;

How do I access the values from the custom class in sql code?

Best Regards

Michael Gould
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Michael Gould, Managing Partner
Intermodal Software Solutions, LLC
904.226.0978
904.592.5250 fax