Change Drupal icon to your logo.

Hi,
I,ve been using DRUPAL for a long time, and since I use this platform, and of course I search around for other websites build on Drupal.
You know this small .ico file which represent small icon on your browsers, I call that command line, small text are when you type in your favourite web sites address.
In most cases developers making custom Drupal themes are sing, I far as I guess .info file with setting up "features[] = favicon" feature and them pasting into theme names folder small .ico file, basically 16x16px.
Ok, cool the result is nice looking icon representing your creative work and implementing good marketing strategy, but when a lot of times you try to login into admin panel this feature gets lost.
To enable it you need to change main favicon.ico file under drupal.6.x look in misc directory, then look for file and simply replace it with your custom icon, and do not forget it place under same favicon.ico name, becaus Drupal system core is configured to search for this file.
Them clear the cache, restart your brovser and you should now see your custom icon on admin area too.
Reminder - when you upgrade to newer version you might need to do it once again... just check it in case, OK.
You might try same with your Joomla too, change favicon.ico file installation folder.
Good luck and lots of ideas..