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+.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1994, 1996 X Consortium
+.\"
+.\" Permission is hereby granted, free of charge, to any person obtaining
+.\" a copy of this software and associated documentation files (the
+.\" "Software"), to deal in the Software without restriction, including
+.\" without limitation the rights to use, copy, modify, merge, publish,
+.\" distribute, sublicense, and/or sell copies of the Software, and to
+.\" permit persons to whom the Software is furnished to do so, subject to
+.\" the following conditions:
+.\"
+.\" The above copyright notice and this permission notice shall be included
+.\" in all copies or substantial portions of the Software.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
+.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+.\" OTHER DEALINGS IN THE SOFTWARE.
+.\"
+.\" Except as contained in this notice, the name of the X Consortium shall
+.\" not be used in advertising or otherwise to promote the sale, use or
+.\" other dealings in this Software without prior written authorization
+.\" from the X Consortium.
+.\"
+.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991 by
+.\" Digital Equipment Corporation
+.\"
+.\" Portions Copyright \(co 1990, 1991 by
+.\" Tektronix, Inc.
+.\"
+.\" Permission to use, copy, modify and distribute this documentation for
+.\" any purpose and without fee is hereby granted, provided that the above
+.\" copyright notice appears in all copies and that both that copyright notice
+.\" and this permission notice appear in all copies, and that the names of
+.\" Digital and Tektronix not be used in in advertising or publicity pertaining
+.\" to this documentation without specific, written prior permission.
+.\" Digital and Tektronix makes no representations about the suitability
+.\" of this documentation for any purpose.
+.\" It is provided ``as is'' without express or implied warranty.
+.\"
+.\" $XFree86: xc/doc/man/X11/XOpDsply.man,v 1.2 2001/01/27 18:20:01 dawes Exp $
+.\"
+.ds xT X Toolkit Intrinsics \- C Language Interface
+.ds xW Athena X Widgets \- C Language X Toolkit Interface
+.ds xL Xlib \- C Language X Interface
+.ds xC Inter-Client Communication Conventions Manual
+.na
+.de Ds
+.nf
+.\\$1D \\$2 \\$1
+.ft 1
+.\".ps \\n(PS
+.\".if \\n(VS>=40 .vs \\n(VSu
+.\".if \\n(VS<=39 .vs \\n(VSp
+..
+.de De
+.ce 0
+.if \\n(BD .DF
+.nr BD 0
+.in \\n(OIu
+.if \\n(TM .ls 2
+.sp \\n(DDu
+.fi
+..
+.de FD
+.LP
+.KS
+.TA .5i 3i
+.ta .5i 3i
+.nf
+..
+.de FN
+.fi
+.KE
+.LP
+..
+.de IN \" send an index entry to the stderr
+..
+.de C{
+.KS
+.nf
+.D
+.\"
+.\" choose appropriate monospace font
+.\" the imagen conditional, 480,
+.\" may be changed to L if LB is too
+.\" heavy for your eyes...
+.\"
+.ie "\\*(.T"480" .ft L
+.el .ie "\\*(.T"300" .ft L
+.el .ie "\\*(.T"202" .ft PO
+.el .ie "\\*(.T"aps" .ft CW
+.el .ft R
+.ps \\n(PS
+.ie \\n(VS>40 .vs \\n(VSu
+.el .vs \\n(VSp
+..
+.de C}
+.DE
+.R
+..
+.de Pn
+.ie t \\$1\fB\^\\$2\^\fR\\$3
+.el \\$1\fI\^\\$2\^\fP\\$3
+..
+.de ZN
+.ie t \fB\^\\$1\^\fR\\$2
+.el \fI\^\\$1\^\fP\\$2
+..
+.de hN
+.ie t <\fB\\$1\fR>\\$2
+.el <\fI\\$1\fP>\\$2
+..
+.de NT
+.ne 7
+.ds NO Note
+.if \\n(.$>$1 .if !'\\$2'C' .ds NO \\$2
+.if \\n(.$ .if !'\\$1'C' .ds NO \\$1
+.ie n .sp
+.el .sp 10p
+.TB
+.ce
+\\*(NO
+.ie n .sp
+.el .sp 5p
+.if '\\$1'C' .ce 99
+.if '\\$2'C' .ce 99
+.in +5n
+.ll -5n
+.R
+..
+. \" Note End -- doug kraft 3/85
+.de NE
+.ce 0
+.in -5n
+.ll +5n
+.ie n .sp
+.el .sp 10p
+..
+.ny0
+.TH XOpenDisplay __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
+.SH NAME
+XOpenDisplay, XCloseDisplay \- connect or disconnect to X server
+.SH SYNTAX
+.HP
+Display *XOpenDisplay\^(\^char *\fIdisplay_name\fP\^);
+.HP
+int XCloseDisplay\^(Display *\fIdisplay\fP\^);
+.SH ARGUMENTS
+.IP \fIdisplay\fP 1i
+Specifies the connection to the X server.
+.IP \fIdisplay_name\fP 1i
+Specifies the hardware display 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.
+.IN "Environment" "DISPLAY"
+.SH DESCRIPTION
+The
+.ZN XOpenDisplay
+function returns a
+.ZN Display
+structure that serves as the
+connection to the X server and that contains all the information
+about that X server.
+.ZN XOpenDisplay
+connects your application to the X server through TCP
+or DECnet communications protocols,
+or through some local inter-process communication protocol.
+.IN "Protocol" "TCP"
+.IN "Protocol" "DECnet"
+If the hostname is a host machine name and a single colon (:)
+separates the hostname and display number,
+.ZN 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,
+.ZN 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.
+.LP
+.IN "Display"
+If successful,
+.ZN XOpenDisplay
+returns a pointer to a
+.ZN Display
+structure,
+which is defined in
+.hN X11/Xlib.h .
+If
+.ZN XOpenDisplay
+does not succeed, it returns NULL.
+After a successful call to
+.ZN 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
+.ZN DefaultScreen
+macro (or the
+.ZN XDefaultScreen
+function).
+You can access elements of the
+.ZN Display
+and
+.ZN Screen
+structures only by using the information macros or functions.
+For information about using macros and functions to obtain information from
+the
+.ZN Display
+structure,
+see section 2.2.1.
+.LP
+The
+.ZN XCloseDisplay
+function closes the connection to the X server for the display specified in the
+.ZN Display
+structure and destroys all windows, resource IDs
+.Pn ( Window ,
+.ZN Font ,
+.ZN Pixmap ,
+.ZN Colormap ,
+.ZN Cursor ,
+and
+.ZN GContext ),
+or other resources that the client has created
+on this display, unless the close-down mode of the resource has been changed
+(see
+.ZN XSetCloseDownMode ).
+Therefore, these windows, resource IDs, and other resources should never be
+referenced again or an error will be generated.
+Before exiting, you should call
+.ZN XCloseDisplay
+explicitly so that any pending errors are reported as
+.ZN XCloseDisplay
+performs a final
+.ZN XSync
+operation.
+.IN "Resource IDs"
+.IN "XCloseDisplay"
+.LP
+.ZN XCloseDisplay
+can generate a
+.ZN BadGC
+error.
+.SH "SEE ALSO"
+AllPlanes(3X11),
+XFlush(3X11),
+XSetCloseDownMode(3X11)
+.br
+\fI\*(xL\fP