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  Name:     insert() - get/set the insert key status
  Usage:    [<logical>] = insert([<logical>])
  Params:   logical value, .T. to turn the insert key on, .F. to
            turn the insert key off
  Returns:  a logical value equal to the current state of the insert
            key - .T. means it is on, .F. means it is off

 ---------------------------------- Example ---------------------------------

                 readinsert(.T.) && insert on, BIOS not updated
                 ? insert()
                 * prints .T., insert on

                 insert(.F.)
                 ? insert()
                 * prints .F., insert forced off, BIOS updated

  Note:     When using the keystat() function, readinsert() does not
            update the BIOS data segment. insert does().