
4.4 Internet Scrapbook 65
guesses may result in important data being missed and/or destroyed,
whereas PBE systems for browsing tasks never destroy a user's data. There-
fore, the inference engine does not need to be as sophisticated as the en-
gine for the editing tasks.
The data access problem can also be avoided. By tapping into the http
stream like a proxy, the PBE component can know the URLs that the user
requested and also what the user inputted into HTML forms. It can also add
the results of program executions into the original Web pages. This flame-
work can be used in SmallBrowse. (However, in the ...