To find all items that reference certain attribute, use the command cmd=feed, followed by ids= and the id of the parent item.

An example: you want to find all the items that reference the justScope attribute. Locate the id of at least one typography, by looking into EdAdmin4 > Typographies applet:

Now, remember that to execute a do command, you need to have a valid ticket. The typical manual method to get a valid ticket is to connect first and sign in with your credentials, e.g. on http://servername/gn4/int/Page.aspx?config=home. Now you can duplicate the tab if you want, or use the same tab and type http://servername/gn4/int/do.ashx?do.ashx?Cmd=feed&ids=1810 (this assumes you want to list things referencing the typography with id = 1810).

Now, you know that a typography is referenced by titles, geometries, formats (justContext), hyphenations, style libraries (justDef), fonts, and font layouts (pubDest reference is there because, in an extremely low probability case, you may want to publish an entire typography - that you will never want to do, so just forget pubDest reference in this context).