Tony, Am I right is assuming that the 'Castle's new tools' option doesn't appear in the list at the moment, i.e. that Acorn C V5 is the old boxed Acorn product? If so, a) is there expected to be much work porting to the new tools and b) does that mean that Acorn C V5 users would stop being able to use OSLib at the next release? Many thanks, Dave Lawrence