If you don't know what Favicon is and what is good for, just use google to find this :)

Favicon in e107:

The header script is looking for the favicon in this order:

1. inside theme folder 

2. inside base folder

The automatically inserted favicon should have a name:

favicon.ico

If you need to insert more favicons, you can use meta tags field in main preferences.

How to check the version of e107:

- in the admin area, the latest icon info and information about the version is in the left column

- file ver.php, location: admin folder / ver.php