If I understand you correctly, you just want to change the titles of the Desktop and Appbuilder windows?
To do this, you can use the _adeevnt.p procedure that comes with Progress. First, you'll need to extract it from the adecomm.pl library, in the Src directory of your Progress installation. This is a procedure that is run by Appbuilder when certain events occur. For example, startup, shutdown, or opening, saving or closing a procedure file.
Full instructions are contained within the procedure and you will be able to use the 'Startup' event to launch your procedure that changes the titles. To change the titles, you can use the SESSION:FIRST-CHILD and SESSION:NEXT-SIBLING handles to search for the desktop and Appbuilder windows. Once you have the window handle, you can change the title easily.
For the modified _adeevnt.p procedure, you'll need to place it somewhere that Progress can reach it. It needs to be placed into a folder called 'adecomm'. If you create that folder in say, your working directory, then Appbuilder will run your version instead of its own.