nimblekit by default does not support any bundles (unless you mastered to do it).
with NKSettings you can save some variable with settings.setValueForKey() and then read it back using settings.getValueForKey().
it's not automatically updated, what I mean
var settings = new NKSettings();
var saved_number = settings.getValueForKey("SomeNumber"); // saved_number now 5
saved_number = 10; // now it's 10, but in settings it's still 5, so if you want it to be saved you call
settings.setValueForKey(saved_number, "SomeNumber"); // now it's number 10 saved for "SomeNumber" key
so basically you can read from prefs only what you put there and saved values persist with application launches