page_load event from pop up windo

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ASP.NET

My requirement is, I have 3 pages webform1.aspx,webform2.aspx and webform3.aspx.

1. first i will redirect from webform1.aspx - > webform2.aspx
2. in webform2.aspx I will select a dropdownlist value, then third page 'webform3.aspx' should come as a popup window.
3. In webform3.aspx(popup), after selecting a value from dropdownlist I need to close the popup window(3rd page) and need to call the page_load event of webform2.aspx.
4. Also when i click on the browser back button It must not go to webform3.aspx(the popup window), it must go to webform1.aspx.

if anyone know please let me know..thanks.....