more thoughts:

could I do something like:

   - define a shared global variable  session.version 
   - = -1 initially, signifying no choice made
   - ? use a callback that gets executed *before *the controller that 
   responds to the request
      - if session.version >-1:
           let the responding controller do its thing
      else:
           if controller allowed to run:
                let the controller run
           else:
                redirect to 'please choose version'
      
Is it possible to implement such a "callback"???

(or is this not the right/best way to achieve the functionality I need?)

thanks,
Luis.

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