To make any variable persistent throught your application: 

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


   1. 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 ''