What does it do? This addition restricts the search of the FIND and REPLACE statements in dobj to the section from the offset specified in off with the length specified in len. Without the addition, the whole data object is searched. off and len are numerical print positions of operand type i. At least one of the OFFSET or LENGTH additions must be specified. If an offset is specified without specifying the length, the dobj data object is searched from the off offset to its end. If a length is specified without specifying an offset, the offset 0 is used implicitly. The values of off and len must be greater than or equal to 0, and the section specified by off and len must be within the length of dobj.
