Sung M Kim

I have a question regarding variables.
Is there a way to ensure that retrieved variable such as *Preference
variables are indeed a built-in PowerShell variables?(they have "None"
as an option for all)

I was thinking about checking if a variable is of type
"System.Management.Automation.ActionPreference" but can anyone just
create a variable with *Preference as postfix and of type
"System.Management.Automation.ActionPreference"?

Any ideas?

- Sung