Using (.px) and (.ntx) Files Concurrently
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     You can use both (.px), as well as (.x), (.y) and (.ntx) files
     concurrently in a CA-Clipper program like this:

     REQUEST DBPX

     // (.ntx) file using default DBFNTX driver
     USE File1 INDEX File1 NEW

     // (.idx) files using DBPX driver
     USE File2 VIA "DBPX" INDEX File2 NEW

     Note, however, that you cannot use (.px) and (.ntx) files in the same
     work area.  For example, the following does not work:

     USE File1 VIA "DBFNTX" INDEX File1.ntx, File2.px