Over my head,... but doable?

[Campbell]

Is this possible?   Depending on user input, open a new (popup) browser window and display something -- Ok, that's easy, but, here is the over-my-head stuff:           Depending on user input in the popup, close the new window         and return to a page in the original browser window.   And, of course I want to use server side Java, such as a servlet or JSP.   If it is possible, any guiding thoughts?   Many thanks.   Phil