I need to develop a application which uses a GPS mobile to get the latitude and longitude coordinates of a person and plot in Google maps. I will be using google AppEngine to deploy the site, so i will be using datastore provided by GAE. I need to know how to plot the values in maps asynchronously , i.e as the value in the datastore changes,without the user requesting again and again through the browser, it needs to be updated asynchronously like cricinfo does for updating scores . What event should i use to the above cause.. Am a beginner in programming, so pls consider my level n help me..
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