As of 12/31/2014 all calculators now include "AutoSave".

This new feature saves calculator information as it is entered to the user's browser local storage. This great feature allows you to exit the calculator and then come back later, with all entries preserved. No more starting over! No data is sent over the internet, and all local data is stored locally and obfuscated. This feature is available on any browser that supports local storage including IE8 and above.

To turn this feature off, you can include the parameter in your KJESiteSpecific.js file: 
KJE.parameters.set("LOCAL_STORAGE",KJE.STORAGE_NONE);

To turn this feature on, you can include the parameter in your KJESiteSpecific.js file: 
KJE.parameters.set("LOCAL_STORAGE",KJE.STORAGE_AUTO);