tkterm is a terminal emulator similar to xterm except that it can be used inside of a Tk script. Unlike a true xterm, you can query the tkterm to see what's on it and you can update the display manually if desired. tkterm is implemented by some clever Expect scripting that uses a pty and a Tk text widget to achieve fast and accurate terminal emulation.
Tkterm supports vi, emacs, and other character-graphic programs built using curses, termcap, or terminfo. (Tkterm also support non-character graphic programs so you run your shell in it and switch back and forth between smart and dumb modes.) Tkterm's most recent enhancement is to automatically provide scrollbars while in 'dumb' mode [L1 ].
tkterm can be found in the example directory of the Expect distribution: http://expect.nist.gov
Bruce Stephens updated it to his "Pterm".