There are multiple levels of control: 1) for each UI component you can select to send events immediately to server or alongside the next "packet" sent to server

There are multiple levels of control: 1) for each UI component you can select to send events immediately to server or alongside the next "packet" sent to server. 2) as we are building on top of GWT - you have the full GWT-based RPC also if you want to do the communication manually.