Xemacs: configuring gnuserv

To have just one instance of XEmacs running and always opening new documents in it, put in the .xemacs/init.el file:

(require 'gnuserv)
(gnuserv-start)
(setq gnuserv-frame (selected-frame))

and configure gnuclient as your $EDITOR. (maybe an "alias xemac=gnuclient" ?)