You can tell if a button and/or link is accessible via an AccessKey if there is a letter within that link that has a dotted underline.
HINT: If you are a developer, you can add an AccessKey to your navigation link by wrapping a single letter in
<em></em> code. If you are a translator, you can define the AccessKeys for the main Backend-Tabs in the section
For: include-nav.php in the language-file by wrapping a single letter in
<em></em> code as well.