Simple naive question: do I need to worry about changing caches on-the-fly, or can I assume one cache will be loaded and endure for the entire gnome-apt session? Second question: what operations invalidate a pkgIterator and/or Package*, if any? While we're at it: I want to know whether to show the Delete, Keep, Install check buttons for each package. What do I need to check to know whether each of these actions is possible, given a package or version iterator? Havoc