Program reuse

Often times a (AI) code library is used as a source of snippets from which you build new programs (see my blog of 20 Feb. 2014) But sometimes you can reuse whole programs. (either your own or those you've collected from other people) For example, in order to perform an experiment in forgetting I was once able to edit a few lines of  (someone else's) neural network program and get the results I was interested in.