Principle of getting new letters from my Google Account on device
<p>I need information about getting new letters from my gmail mailbox: i turn on synchronization on my device, and when my mailbox get a new letter gmail client on my device will respond to it and show me notification. How does it work? Gmail client sends requests every second/minute or there is mean to respond to this event? I need it, because i have been making application which must respond to a new event in Google Calendar. Thank you.</p>
