No, that is not possible.No, it is not possible.
Yes, Gmail is an email system.
Yes, that is possible.
Hover over 'My Account' and a drop down menu will appear. Click 'Edit Profile'. Enter your password, and scroll down to the bottom of the page. There is a box there, put the userlookup code in there....
You fill in the last box on http://www.neopets.com/userinfo.phtml