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   During the creation of an index, the marked (tagged) fields will make up
   the indexkey expression. These fields are called Key Fields. While the
   indexkey expression is one, the key fields are considered separately.

   By pressing the Fields button on the index list, all fields that make
   up the selected index are shown.

   With Ins, Space Bar and Del keys you can respectively insert,
   modify and delete the key fields.

   To vary the order in which the key fields are displayed, use the Move
   button. The position of the field within the expression used to build the
   indexkey and, therefore, the key itself, will be modified.