the key in questions is

HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main

and i want to alter the Key Value from the app directly fot he start page URL.

the key can be chaged if it is set to a particular one in button event handler butthe part of providig the user to put a value of his choice in the app and then pressing a button to replace is the diff part i think.

lets see if i have any luck eith the coders here