1. A method for recalling previously generated user data in a computer which includes a memory, the method comprising: generating user data in response to signals generated by a user; recording the user data in the memory; associating with the user data a description of the user data wherein the description comprises one or more instances of each of one or more elements of a collection of two or more elements; forming two or more categories corresponding respectively to two or more of the elements; and associating the user data with a selected one of the categories, which corresponds to a selected one of the elements, wherein one or more instances of the selected element are part of the description of the user data; and recalling the user data from memory, the step of recalling comprising: receiving signals which are generated by a first gesture of the user and which specify the selected category; and receiving data selection signals which are generated by a second gesture of the user and which identify the user data within the selected category.