Click above to get retro games delivered to your door ever month!

   Allows to enter an expression to apply to all the fields that make up the
   index.  The "expression" field can contain, in addition to the expression
   applied to the index, Clipper or user defined functions and memory
   variables.  By pressing the keys Alt-1 the user can select from a list
   of already defined functions or variables or create new ones.  Within this
   field, the % character can be used.  This character will be substituted
   with the concatenation of the fields that make up the index.

   Let's suppose that we want to create an index for the conversion into
   capital letters of the concatenation of two fields and that this index is
   to be constructed on fields Field1+Field2.  By entering UPPER( % ) within
   the "expression" field the final index will result in UPPER( Field1+Field2
   ). The character % (percent) therefore substitutes, in the expression
   field, the sum of the index's fields.