If you open the VBE and press Ctrl+T, a Components dialog appears with two tabs: Controls & Designers.
From the appearance of the dialog this has been around a long time. In fact, exactly the same dialog can be found going back to A2000 if not earlier. It also appears if you open the VBE of any other Office program such as Word & Excel.
However, what is its purpose (if any)?
The Controls part shows a list similar to the Access reference list but not identical to it.
The Designers list just contains two items.
I cannot get anything to happen when I click on any item in the dialog
EDIT: Added screenshots that I couldn't do when posting thread