How to copy and paste the data in to from personal email id

Hi,

My application contains 5 pages. it is new user registration  application. in second page, when the user enter his email address  and click Next button, an email notification with 8 digit verication code will be bent to his email address. Then he r verify his email address, copy and paste that verification code in verification  text box in the application , and proceed to further pages to complete the registration process. I could't understand the script for this. Protocol is HTTP/HTML.

If any one help will be appriciated. 

Thanks,

Chandra.