I am afraid the only way to solve this is running XEmacs (and libgpm) under a debugger and look at what happens. Even without much pogramming experience that should be doable. Karl, did you? Debian hamm seems to have 1.13. As far as grep can see XEmacs does not install its own SIGTSTP handler at all. Basically, all it does is send SIGTSTP to its whole program group if M-x suspend-emacs is called. That will be at the end of the redisplay code, that should not be too difficult. I don't think it is that different. I find the current way gpm is implemented (114 lines of C code, including comments and whitespace) in XEmacs very clean. It does not involve running another subprocess from lisp nor does it involve manufacturing events from lisp code. The latter is only possible as of 21.0 anyway and is very tricky to get right. Jan