The content tab label in Ted4 and Fred4 contains various information about what's opened and its status.
Name
On many content tabs there appears the name of the opened item, e.g. of the page (Daily Journal Pag. 8-9). Some data can be re-configured. An example is the content tab of editions.
Status information
On Page content tabs there appears also the name of the currently assigned master page, within parenthesis (Double).
On Publishing destinations content tab, there's also the status of the listing - not checked out, or checked out (the lock icon).
Alert information
On various tabs there appears also the alert marker - a blue triangle that swings if there's content to update.
Search criteria summary
On Shell listings, under the label Content, appears the summary of the current search criteria (Folder is /JRC/5-Ready).
Closing button
The closing button x appears only on the current tab.
The information, displayed on the content tab label is partially configurable.
In the GN4 browser, the content tab label contains just the name of the content tab and no other data.