Hey Guys,
Thanks for your help. Yeah, I decided to rethink my design so it would not require the refreshing of the window. Makes things easier. Once the child finishes its thing, it refreshes the parent and then closes.
This web application is going to be running on the thin web server. It it not sophisticated enough in terms of resources, and peformance to support Ajax. Thin webserver runs a a real time OS. The html files are not even stored. What you have to do is write C-code that tells the server how to construct the html page you want on the fly.
Once again thanks for your comments.