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The only way I know of would be to write your admin data to a database or text file and dynamically output the index page, or in your admin programming overwrite the index page.
Example 1: Form-> perl or php script-> write admin info to database or file.
index page loads -> open page template -> open admin data -> insert into template -> output to browser.
Example 2: Form-> perl or php script -> open template -> insert form data into template -> overwrite index page.
All of this would have to be done server-side with programming and there are file permission issues to address, which is what makes a Javascript solution . . . interesting to say the least. :D
U can make a content and show a new div(not a new window). In this div u can show any information what u want.
But if u want to open a new window, the decision is php,perl or aspx.
But isn't that from the same page? He's talking (I think?) about an admin area editing a second page. and from that page you can always open a new window . . maybe I mis-read your explanation.