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   By pressing the Space Bar on an inherited field shown in the list, it
   it possible to see and eventually modify the inherit expression in the
   field.
    The expression displayed is the value that the source field will inherit
   when the record of a lookup file is selected from a window. Within this
   option, it is possible to insert, other than the typical expressions on
   fields, user defined functions or memory variables. The Alt-1 keys
   allow to display the functions or variables already set or the files in
   which the fields that can make up the expression are found. The user
   functions can be defined inside the Symbols (see symbols) environment
   or created directly on the functions list with the Ins key.