How to capture username from user already logged into google apps?

Hello All,

I am new to GWT.  My company uses google apps.  I have created a widget that will go on an internal google site and that interfaces with our ticket entry system to post tickets.  All of this is working just fine and I have had a lot of fun learning how to do it.

Here is what I would like to do: when someone comes to the google site where my widget will live, capture their google username (they will most likely be logged into google apps) so I can populate the name field with their name.

I have not had much luck googling on this, does anyone have any suggestions on where I might get started?  Any links to articles or tutorials, or even an explanation of how this works (use small words!) will be appreciated.

Thanks,
BRL

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