[RCD] Difference between "Checking for new messages..." (manually) and "Refreshing..." (automatically)?

When I click on the button "Check for new messages", an AJAX response "Checking for new messages..." is being displayed.

Under Settings/User Interface, I have set the option "Refresh (check for new messages, etc.)" to "every 1 minute(s)".

When the latter function is initiated autmatically, the AJAX response reads "Refreshing...".

Are both functions the same thing? Or does the latter one anything more (because of the "etc." in the description) than a manual click on the "Check for new messages" button?

If they are the same thing, then I suggest to use the same AJAX response. If they are not the same - what exactly is the difference?