Is there a way to change the text on the title bar of the window.

Background - I use dosbox to run several instances of the same dos program ( plc programming software rather than a game). I use the serial port mapping function in the config file for each instance so that each version of the program thinks it is talking to com1 but is in fact redirected to the specified com port in the dosbox config file.

The problem - when having several instances running, I can't tell which window is which when I come back to the machine several hours later. The Plc programmer doesn't display this on all screen so the only way to tell is to escape back to the original menu and see what program is loaded.
Is there a way to write text to the title bar of the window ( say from the config file that is opened ), e.g. machine 1, machine 2 etc.
The title bar actually says Dosbox v7.4 3000 cycles etc......, so obviously dosbox has the capability to write to it, just wondering if this can be written to by a config setting..

Thanks in advance....