Use of updateAsync in setting.json file ?

When I generate a mobile app via Phonegap, I can set a few settings in the setting.json file. I like to know where the setting updateAsync is used for. I can not find documentation for this setting. Is this setting related to async use of microflows or is it related to off line use ? { "url": "", "enableOffline": false, "requirePin": false, "updateAsync": false, "username": "xxx", "password": "xxx" }  
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