How can it do that?

[hzeng]

Hello,
    I find the interest thing in many example code that you can create many same type 
of widgets use 
a same widget name, but the system can differ these widgets although they have the 
same name.

such as:

    Widget *button;
    button=gtk_button_new_with_label("button1");
    
gtk_signal_connect(GTKOBJECT(button),"clicked",GTK_SIGNAL_FUNC(callback),(gpointer)"button1");

    ...
    button=gtk_button_new_with_label("button2");
    
gtk_signal_connect(GTKOBJECT(button),"clicked",GTK_SIGNAL_FUNC(callback),(gpointer)"button2");

    ...

 At this situation, the system still can know the "clicked" signal is come from 
button1 or come from button2 and the
callback founction can print different message. I am wondered about these. Can I get 
the reason?

Thank you very much
Hzeng
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