Okay, I am learning Dashcode to make some widgets. One question is, if I create and publish this widget, how can my customers get updates, and/or a pop-up telling them there is an update available. Also, say I want to create a currency converter. How do I tell my widget to get the current, for example, American to Euro currency. If I find a site that updates this info daily, how do I tell my widget to update according to this site. Thanks!