How CMS handles postback for integrated web applications?

Exoldmods

New Member
Currently I am working on a project to integrate legacy application (ASP.NET) with a content management system. There are two web servers, one act as cms server which is public facing and other the legacy application website behind the firewall. CMS drive the show to render header, footer, left and right info pans and menu. My requirement is to show the legacy application aspx pages inside a content area of cms. Everything works fine except postback. The form submits to cms website whereas I want it to postback to legacy application. How CMS or SharePoint achieve this? For example if a webpart is having a submit button which postbacks, how SharePoint submit the form to webpart? What is the architecture behind this?
 
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