Abstract: A request message for transfer across an interface is formed by a method comprising the steps of representing each of a plurality of data chunks to be stored in the message by a respective chunk object, declaring each of the chunk objects as a variable on a program stack, storing a first data chunk in a first area of the message; storing a second data chunk in a second area of the message; and employing the chunk object representing the first data chunk to locate the first data chunk in the course of loading into the first chunk an offset value representing the location of the second chunk, wherein the offset value represents an offset from a base address of the message. The method enables an overloaded deference operator to employ an offset stored in a chunk object on the program stack to locate a particular chunk.