[code to design the GUI]
     [drop-down listbox to select script to run]
     [display frame x if script x was selected]
     [accept extraction options if any]
   ...                             
   MainLoop ;                      

     [sub to call program 1]   # different scripts are
     [sub to call program 2]   # run depending which
     ...                       # buttons the user clicked
     [sub to call program N]   # N < 100