To make any variable persistent throught 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 ''