1. A method for inserting new instructions between instruction items of preexisting object code, at least some of said instruction items containing addresses, said method comprising the steps of: a) providing a new object code table for storing items in; b) storing, for each instruction item in the preexisting object code, a new code block into the new object code table, said new code block comprising any desired new instructions and the instruction item; and c) updating addresses in instruction items in the new object code table.