xhost/display

when I am as root, graphic enviroment, I have no problems at all for using emacs, I just (windowsmaker) type emacs the name of the file and it opens ok, but if I am a user not root, I try and it says that xhost can not open conections to 0.0, set DISPLAY -d ... what happen? how can I correct this in order to be able to use emacs as a user, I am not working on any network, not loading graphical enviroment from anywhere else but my own pc.... cheers