Why not open the Child form in a new browser window? They will both share the same session. To open in a new window, add the onclick attribute to the button that normally causes the redirection.

<asp:button id="myButton" .. onclick="window.open('myUrl.aspx')"/>

>Web Form: I have linkbuttons on my parent form to go to one of four child forms. I carry a few session variables to the child forms. On each child form, I am using another linkbutton to "Go Back to Main Page" which links back to my parent form. The IsPostBack property is false as I'm redirected to the parent form causing the form load() to fire again. I don't want the load() to fire because it resets all the controls. I want to carry the session variables, from the child form back to the parent form, to be displayed until the user clears the form. Please help! Hope this is clear enough.