Calling a function on the parent from a popup

I have an asp.net form, which calls a popup window.

The popup window, based on some user input should call a vb.net function on the parent window.This function is supposed to run a stored procedure that will fill the fields on the parent form with the results and the input parameter to the stored procedure will be the user input from the popup window.

What I want to do is to returning data from the child and triggering an event on the parent.

Is this possible?
If not is there any other way I can do it?