Perl, Net::DBus, session bus usage?

Question

Perl

I understand with Net:: DBus, for testing I want to write two simple programs, one provides an interface, the other uses it.
I wrote a simple test code:

#!/usr/bin/perl
use strict;
use warnings;

package MyObj;
use Net::DBus::Exporter qw(org.example.Tao);
use base qw(Net::DBus::Object);

sub new {
    my $class = shift;
    my $service = shift;
    my $self = $class->SUPER::new($service, '/MyObj');
    bless $self, $class;
    return $self;
}

dbus_method("Hello", ["string"]);

sub Hello {
    return 'Hello';
}

package main;
use Net::DBus;
use Net::DBus::Reactor;

my $bus = Net::DBus->session;
my $service = $bus->export_service("org.example.Tao");
my $object = MyObj->new($service);
my $reactor = Net::DBus::Reactor->main();
$reactor->run();

return 0;

Details about my environment:
I work via ssh, and I use:

Perl, v5.8.8 built for x86_64-linux-thread-multi<br/>
Linux example.com 2.6.32.19-0.2.99.17.22250fd-xen #1 SMP 2010-09-13 10:16:50 +0200 x86_64 x86_64 x86_64 GNU/Linux<br/>
CentOS release 5.4 (Final)<br/>

When I try to run test.pl I get an error:

org.freedesktop.DBus.Error.Spawn.ExecFailed:<br/>
Failed to execute dbus-launch to autolaunch D-Bus session<br/>

The line that causes the error:
my $bus = Net::DBus->session;
I searched in Google, found that dbus-launch is needed for happiness.
Did yum install dbus-x11.
Question one: why package from x11?
Tried to run mine again, test.pl. Got another error:

org.freedesktop.DBus.Error.Spawn.ExecFailed: <br/>
dbus-launch failed to autolaunch D-Bus session: <br/>
Autolaunch error: X11 initialization failed.<br/>

I read the manuals again, I realized that I did not have the DBUS_SESSION_BUS_ADDRESS variable set and that the session bus was not running at all.

DBUS_SESSION_BUS_ADDRESS is empty:<br/>
[[email protected] perl]# ps ax|grep dbus|grep -v grep<br/>
1019 ? Ss 0:00 dbus-daemon --system<br/>

Although the same wiki says that the session bus starts for each user.
Tried to start it with dbus-launch

[[email protected] perl]# dbus-launch --sh-syntax<br/>
DBUS_SESSION_BUS_ADDRESS='unix:abstract=/tmp/dbus-smHadq6yxV,guid=101ccd74fb75ae501485ed004e2a9043';<br/>
export DBUS_SESSION_BUS_ADDRESS;<br/>
DBUS_SESSION_BUS_PID=5037;<br/>
[[email protected] perl]# ps ax|grep dbus|grep -v grep<br/>
1019 ? Ss 0:00 dbus-daemon --system<br/>
5037 ? Ss 0:00 /bin/dbus-daemon --fork --print-pid 4 --print-address 6 --session<br/>

But DBUS_SESSION_BUS_ADDRESS is still empty.
So, the question is:
What preparatory steps need to be taken in order for my program to work on behalf of any user in the Net:: DBus system and use its session bus. Or maybe you can do nothing and start the bus directly from my program?
In general, how to work with DBus?