Activation
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 Conditional Indexes

     The developer need only specify the FOR condition when creating the
     index.  In doing so he must be fully aware the index will no longer be
     accessible to pre-CA-Clipper 5.2 applications.

 Temporary Indexes

     The developer need only specify a scope other than FOR when creating the
     index.  In doing so he must be fully aware the index will no longer be
     accessible to pre-CA-Clipper 5.2 applications and that the index created
     is not maintainable.

 Header Changes

     The signature byte of a .NTX file is 6 for a unenhanced NTX index.  If
     the index is created as a conditional index it will have a signature of
     7 hex (6 hex ORed with 1 hex).  If the index is created as a temporary
     index it will have a signature of E hex.  (6 hex ORed with 8 hex).  See
     Figure 7-1 for an illustration of all the possible values for the
     signature byte.