Update the Value of External Property

Hi everyone! 

I'm about a month into creating my first dashboard in Simhub (specifically for F12021). The progress has been great and I'm looking forward to posting it when it's complete. I need to access values calculated in a Javascript routine attached to a text box, from another text box so I don't have to re-do the same calculations. I'm hoping it's possible to update the value of an ExternalScript property (created in "NCalcScripts\Samples.ini") from within a Javascript routine. 

If not, is there any way that I can create a global variable (even better, an array) that can be updated and accessed by Javascript attached any component?

Thanks!!