Example

 $ SORT/KEY=(POS:1,SIZ:5,DECIMAL)/STABLE PRICESA.DAT,PRICESB.DAT, -
 _$ PRICESC.DAT SUMMARY.LIS

     In this sort operation, records with equal keys from
     PRICESA.DAT will be listed first, followed by those from
     PRICESB.DAT, followed by those from PRICESC.DAT.