exe and dll communication

Question

please forgive me if this is not the right subforum to post this question, i could not find a more suitable one... i have an app (exe) that polls data and opens a process according to that data in the bacground, now i want that data to be displayed in an IE window using an activex control. i know how to create that activex control and display it (using this great little article -> http://www.c-sharpcorner.com/Code/2003/March/ActiveXInNet.asp ) and my app is already doing it's work properly, so my question is how do i get them to talk? is there an interface i could write for the app that could somehow bee seen by the activex control? do i have to write a separate com object that will handle the communication? if you could reference me to some articles or other material on this subject i would greatly appreciate it. thanks in advance...