ESQL/C: Insert data into BYTE column from BYTE host variable

In the Informix Guide to SQL: Reference December 1991 Page 3-5 mentioned that "You can insert data into BYTE column from BYTE host variable (INFORMIX-SQL, ESQL/C)" I got the impression that we need locator structure to handle binary large objects (blobs) (TEXT, BYTE) ? Does this mean we don't need locator struture in the application program any more ? Can somebody post some ESQL/C sample code ? Or let me know where I can find a sample ? I use Informix-ESQL/C Version 5.0 Thanks Tony