symbiotic app question

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http://androidforums.com – My phone is running Android 2.3.4 rooted which has allowed me to get rid of most of the preloaded apps that came with it. There are a few however that I would like to get rid of and use other applications instead, such as using Business Calendar Free instead of the stock android app. My question is this, do I need to have the android calendar app installed in order for Business Calender app to sync or does it connect with Google directly and not in the symbiotic way I think it does now (Android calendar syncs and business cal just shares the data) Hope I have explained this correctly becau (General)