A spork is an eating utensil, a combination of a spoon and a fork. It can be used to reduce the number of utensils that a fast-food restaurant has to stock, as they, at least around where I live, give out cheap plastic cutlery with certian foods. The spork allows the restauranteurs to only stock sporks (and knives, in some cases), reducing the number of utensil types to stock.
multiui allows a programmer to write a menu-driven script that can display in a number of different ways (three when this was written), but not be concerned about the details of the displaying, such as setting up curses or adding buttons to a vbox, or even which set of output modules to load. This means that a program only has to include one module, that can then deal with multiple form of outputs, similar to how the restaurant has one utensil that can do the job of two (or three, if the food is sufficiently yielding). The utensil might not do as good a job with some foods as either a spoon or a fork, but it can do an adequate job, and multiui is limited in what it can do. But if generic menus, messages, and selections are all that are needed, multiui can possibly do it.