dynamic value Modern UI

I have a feils in one of the custome UI screen the default content of which is based on machine to machine. How to populate the feilds

EX: A feild like Licence User and Company which i read fromt the registry and want to have them in the feilds.

How to Pls help

Use WriteINIStr to write the value to the INI file after extracting it and before displaying it.

-Stu