This invention provides a file system for organizing files in a data processing and handling device. A set of annotations signifying locations or time in files are provided. A search process combines annotations and intervals together into a final result. A user interface is operatively connected to the device that allows the user to enter requests and data. Illustratively, the user requests the intervals in files that corresponds to a search criteria and the search process searches through the annotations and combines them to find the intervals in files or groups of files where the condition is true, and the intervals of the found files are arranged to be displayed to the user on the interface.