To make any variable persistent throughout your application: 

   * ''after you are logged in'', you have a session going 
   * on any page you can do: 
    tk::session::setAttribute -name HOME -value "/home" 


   * and to access it from any other page you do: 
      set home [tk::session::getAttribute -name HOME] 


'''Take a look at "Login.tcl" file'''

''now that's simple ''
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[EKB] That does sound cool. But what is it in reference to? Where is "Login.tcl"? - [RS]: See [Mel's internet toolkit]. But persistant data storage is basically just writing stuff to disk (or in the [registry] if you so wish. However, note that even though the above uses the ::tk namespace, it is not part of [Tk].