FIND vs SEEK
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     In CA-Clipper, you can use the FIND command only to locate keys in
     indexes where the index key expression is character type.  This differs
     from dBASE III PLUS where FIND supports character and numeric key
     values.

     Note:  In CA-Clipper  programs, always use the SEEK command or the
     DBSEEK() function to search an index for a key value.

     The DBFNDX driver lets you recover from a data type error raised during
     a FIND or SEEK.  However, since Error:canDefault, Error:canRetry, or
     Error:canSubstitute are set to false (.F.), you should use BEGIN
     SEQUENCE...END to handle a SEEK or FIND data type error.  Within the
     error block for the current operation, issue a BREAK() using the error
     object the DBFNDX database driver generates, like this:

     bOld := ERRORBLOCK({|oError| BREAK(oError)})
     .
     .
     .
     BEGIN SEQUENCE
        SEEK xVar
     RECOVER USING oError
     // Recovery code
     END
     .
     .
     .
     ERRORBLOCK(bOld)

     There is an extensive discussion of the effective use of the CA-Clipper
     error system in the Error Handling Strategies chapter of the Programming
     and Utilities guide.