25. A code-portion-handling tool as claimed in claim 17 , wherein such manipulation comprises performing a predetermined process on at least part of said candidate code portion.
25. A code-portion-handling tool as claimed in claim 17 , wherein such manipulation comprises performing a predetermined process on at least part of said candidate code portion. 27. A code-portion-handling tool as claimed in claim 25 , wherein the predetermined process is an optimization process operable to optimize the candidate code portion for a predetermined purpose.