I'm using Gnu emacs in Windows XP, and the default window title reads "emacs@ACH1797VM2" rather than the buffer title, which is what I want and which is the correct default behavior, as far as I know.
After reading https://stackoverflow.com/a/2338352/1001165, I put the following line at the end of my ~/.emacs file, but there's no change in the behavior.
(setq frame-title-format "%b - emacs")
I can change the window title just fine with
M-x set-frame-name NewName RET
but I want it to change automatically to match the buffer name.
I'd say the line is correct. You can copy & paste the expression into the *scratch* buffer and hit C-J. If the window title changes, then it should change too when you add the line in your .init.el. There's also the possibility that your init file is not in the right place or it's not named correctly... if I recall correctly in Windows it doesn't start with a dot, but with an underscore.