Question regarding the extern variable used for the properties panel

 
Is it possible to set a value to an extern variable after the properties panel has been processed so that the next instance of the properties panel would retain the values input the time before. If that is possible how is it done?

Thank You,
Deane
 

The Properties panel reads the initial settings from the compiled code.

But, EA's and Scripts have the ability to load a saved presets file.

Reason: