Radio Userland doesn't offer access control at the present time, so your weblog's open to the public from the moment you set it up.
Step 1: Change Your User-Agent String
First, modify the User-Agent string in Internet Explorer. The User-Agent string is sent to a server when you request a page, and it identifies your browser, browser version, and often other things about your system.
Here's my current User-Agent string for Internet Explorer 6 on Windows XP:
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Q312461; .NET CLR 1.0.3705)
You can see your browser's User-Agent string on this IP Delivery browser variable page.
The User-Agent string contains several tokens in parenthesis separated by semi-colons. You can add a token of your own by adding an item to the Windows Registry. (Standard disclaimer: Be careful when editing your registry. It's a great way to hose your system if you're not sure what you are doing.)
Run the Registry Editor and open the folder My Computer, HKEY_LOCAL_MACHINE, SOFTWARE, Microsoft, Windows, CurrentVersion, InternetSettings, User Agent, Post Platform.
Add a new item: Choose Edit, New, String Value. An item will appear in the Post Platform folder with the type REG_SZ and the name New Value #1. Give it a new name that isn't likely to appear in someone's User-Agent string -- Foobar, Swordfish, Heffalump, Woozle, or the like.
Exit the Registry, shut down Internet Explorer, and open it back up. Your User-Agent will have the new token in it. When I added Swordfish to mine, it became this:
Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; Q312461; Swordfish; .NET CLR 1.0.3705)
Step 2: Add a Script to Your Weblog
After you have modified your User-Agent string, add a script to the HTML templates of your weblog to look at that string and send people to a different page if their User-Agent doesn't contain the token.
If you know how to change your templates and republish the weblog, add a script like this to the top of each page that should not be open to the public, right after the <body> tag:
This script requires two changes:
First, modify the text in the if statement so that it includes everything in your User-Agent after the first "/" character.
Next, set the variable top.location to the URL where people should be sent if they don't have the right User-Agent string. I sent people to the Radio Userland home page.
Save the template and republish the pages in your weblog that use the template.
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