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USAGE
   int scdcktop(
           int handle,
           void *key,
           long *recno );

PROTOTYPE IN
   sc_base.h

DESCRIPTION
   scdcktop will set the current key pointer to the first logical key in
   the index and return the key value key and data record number recno
   associated with the new current key.

NOTES
   The user must ensure that the buffer used to return the key is large
   enough to hold the entire key. The maximum length of the key can be
   determined via a call to scdcinfo.

   All keys are returned as strings.

EXAMPLE
   #include <stdio.h>
   #include <softc.h>
   #include <sc_base.h>

   void main()
   {
     int ntx;
     char date[17];
     long recno;

     scdinit(20,0);
     if (scdcopenx(&ntx,"TOCDATE.NTX",SC_BUFFER) == SC_SUCCESS) {
       date[16] = 0;
       scdcktop(ntx,date,&recno);
       printf("%s %ld\n",date,recno);
       scdcclose(ntx);
     }
     scdterm();
   }