XOpenDisplay man page on DigitalUNIX

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XOpenDisplay(3X11)					    XOpenDisplay(3X11)

       XOpenDisplay, XCloseDisplay - connect or disconnect to X server

       Display *XOpenDisplay(display_name)
	       char *display_name;

	       Display *display;

       Specifies  the connection to the X server.  Specifies the hardware dis‐
       play name, which determines the display and communications domain to be
       used.  On  a  POSIX-conformant  system, if the display_name is NULL, it
       defaults to the value of the DISPLAY environment variable.

       The XOpenDisplay function returns a Display structure  that  serves  as
       the  connection	to  the X server and that contains all the information
       about that X server.  XOpenDisplay connects your application to	the  X
       server  through TCP or DECnet communications protocols, or through some
       local inter-process communication protocol. If the hostname is  a  host
       machine	name and a single colon (:) separates the hostname and display
       number, XOpenDisplay connects using TCP streams. If the hostname is not
       specified,  Xlib uses whatever it believes is the fastest transport. If
       the hostname is a host machine name and a double colon  (::)  separates
       the  hostname and display number, XOpenDisplay connects using DECnet. A
       single X server can support any or all of  these	 transport  mechanisms
       simultaneously.	A particular Xlib implementation can support many more
       of these transport mechanisms.

       If successful, XOpenDisplay returns a pointer to a  Display  structure,
       which  is defined in <X11/Xlib.h>. If XOpenDisplay does not succeed, it
       returns NULL. After a successful	 call  to  XOpenDisplay,  all  of  the
       screens	in  the	 display  can be used by the client. The screen number
       specified in the display_name argument is returned by the DefaultScreen
       macro (or the XDefaultScreen function).	You can access elements of the
       Display and Screen structures only by using the information  macros  or
       functions.   For information about using macros and functions to obtain
       information from the Display structure, see section 2.2.1.

       The XCloseDisplay function closes the connection to the	X  server  for
       the  display  specified	in the Display structure and destroys all win‐
       dows, resource IDs (Window, Font, Pixmap, Colormap, Cursor,  and	 GCon‐
       text),  or other resources that the client has created on this display,
       unless the close-down mode of the resource has been changed (see	 XSet‐
       CloseDownMode).	Therefore,  these  windows,  resource  IDs,  and other
       resources should never be referenced again or an error will  be	gener‐
       ated.  Before exiting, you should call XCloseDisplay explicitly so that
       any pending errors are reported as XCloseDisplay performs a final XSync

       XCloseDisplay can generate a BadGC error.

       AllPlanes(3X11), XFlush(3X11), XSetCloseDownMode(3X11)

       Xlib -- C Language X Interface


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