sending and receiving information from the GWT server server

Hello,

  

 I am very new to GWT, I am just trying to create a sample application form, which contains basic information. I need to know how to retrieve information from the server

For, eg :  if we have a radio button as male and female, and we choose as "male" and send to server it should display the given information in a pop-up window.

I have created the window and other programs, but don't know the event handlers and the functions that are used to send and receive the information.

could anyone help me to do this function?

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