# Copyright (c) 1990 The Regents of the University of California.
# Copyright (c) 1994-1996 Sun Microsystems, Inc.
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
#
#
=head1 NAME
Tk_MainWindow - find the main window for an application
=for category C Programming
=head1 SYNOPSIS
B<#include E<lt>tk.hE<gt>>
Tk_Window
B<Tk_MainWindow>(I<interp>)
=head1 ARGUMENTS
=over 4
=item Tcl_Interp *interp (in/out)
Interpreter associated with the application.
=back
=head1 DESCRIPTION
If I<interp> is associated with a Tk application then B<Tk_MainWindow>
returns the application's main window.
If there is no Tk application associated with I<interp> then
B<Tk_MainWindow> returns NULL and leaves an error message
in I<interp-E<gt>result>.
=head1 KEYWORDS
application, main window