Patent Document

CROSS-REFERENCE TO RELATED APPLICATIONS 
   This application is a continuation of patent application Ser. No. 09/494,801, filed on Jan. 31, 2000 now U.S. Pat. No. 6,981,225. 

   BACKGROUND 
   This invention relates generally to Internet browsers. 
   Internet browser software generally provides a window which enables the user to provide input commands for viewing Internet web pages. A number of users use a bookmark or favorite system to link quickly to web pages of interest. Thus, the user may repeatedly return to a given web page to determine whether new information is available. Sometimes web pages indicate new information by highlighting or otherwise pointing to information which is changed. 
   However, in many cases, the user is forced to scan through one or more pages at a given web site to determine whether there is any new information which may be of interest to the user. This can be a time consuming and laborious job. 
   Thus, there is a need for a simpler way to determine the differences between web pages over time. 
   SUMMARY 
   In accordance with one aspect, a method includes causing a processor-based system to difference a cached and current version of an Internet web page. The difference between the cached and current versions is then indicated. 
   Other aspects are set forth in the accompanying detailed description and claims. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
       FIG. 1  is a depiction of an exemplary web page; 
       FIG. 2  is a later version of the exemplary web page shown in  FIG. 1 ; 
       FIG. 3  is a depiction of a web browser display achieved by differencing the pages shown in  FIGS. 1 and 2 ; 
       FIG. 4  is a flow chart for software for implementing one embodiment of the present invention; 
       FIG. 5  is a block diagram of a processor-based system in accordance with one embodiment of the present invention; and 
       FIG. 6  is a view of a web browser navigation bar in accordance with one embodiment of the present invention. 
   

   DETAILED DESCRIPTION 
   In accordance with one embodiment of the present invention, a web browser may include software to enable the differencing or subtraction of a cached web page from a currently available web page. Using the differencing functionality, one can determine what new features have been added to a given web page. This avoids the need to carefully scrutinize the new page and to manually compare it to the cached version of the web page. 
   For example, in one embodiment of the present invention, at the click of a mouse button, one can determine what are the differences between the old and new versions. The viewer can then examine only the changes to find the new information. 
   Referring to  FIG. 1 , an earlier version of an exemplary web page is illustrated. This page may be cached by the web browser.  FIG. 2  illustrates a later version of the same web page. Referring to  FIG. 6 , a browser navigation bar may include an icon labeled “subtract”. When the user selects the subtract icon on the browser window navigation bar, the cached web page, illustrated in  FIG. 1 , may be differenced or subtracted from a current web page indicated in  FIG. 2 . The result is the difference between the cached and current web pages. The differences may be displayed as indicated in  FIG. 3 . 
   Thus, in one embodiment of the present invention, when the user operates the navigation bar subtract icon, the cached version of a web page and the currently displayed version are automatically subtracted. As a result, only the new material contained in the current version is displayed, as illustrated in  FIG. 3 . 
   Referring to  FIG. 4 , the user initially launches a current web page as indicated in block  10 . The browser then loads the current page from the web server as indicated in block  12 . When the user mouse clicks on the subtract icon as indicated in block  14 , the software compares the cached image for that web page to the current server image in one embodiment of the present invention. A display with the repeated information blanked may show only the new information, as indicated in block  16 . 
   In one embodiment of the present invention, the software may be provided as a plug-in to an existing browser. In another embodiment of the present invention, the browser software may be originally provided with the subtract or differencing functionality. 
   With the subtract functionality, the user then has the option to toggle between a display which shows only the new information, such as  FIG. 3 , and the current web page (block  18 ,  FIG. 4 ). This toggling may be implemented for example by repeatedly mouse clicking on the subtract icon on a navigation bar, for example. Selecting the subtract icon the first time may display the difference image. Selecting the icon again returns the display to the current server image. 
   Referring to  FIG. 5 , a processor-based system  22  includes a processor  24  coupled to a chipset  26  in one embodiment of the present invention. The chipset  26  may couple a system memory  28 , a graphics accelerator  30  and a display  32 . In addition, the chipset  26  may be coupled to a bus  34  in turn coupled to an interface  36  which may be part of a chipset. The interface  36  in turn couples a hard disk drive  38  which may store the software  20 . The software  20  may, in one embodiment of the present invention, be an embodiment of a web browser or may be plug in software which operates with an existing web browser. 
   Comparison software is commercially available. For example, the Netscape Web Publisher compares different versions of a file. The output is a hypertext mark up language (HTML) file displayed in a web browser window that highlights where the versions differ. 
   Instead of merely displaying only the new material, the new material may be displayed in a highlighted fashion. For example, new material may be underlined or may be displayed in different color so that the viewer can see the new material on the display of the current web page. 
   In still another alternative, instead of responding to the user&#39;s selection of an icon, the system may automatically provide an indication of the differences between the two web pages. For example, in one embodiment of the present invention, the current web page is initially, automatically displayed with highlighting, indicating the new material added to the cached web page. This avoids the need for the user to select the differencing functionality and still allows uninterrupted viewing of the current version of the web page. 
   In still another embodiment of the present invention, instead of displaying only the new material, in one embodiment of the present invention, the new material may be displayed in one way and any deleted material may be displayed in another way. For example, in one embodiment of the present invention, new material may be indicated in one color and deleted material may be indicated in a different color. 
   As yet another embodiment of the present invention, the differencing software may determine whether there are different links provided in a new version of the web page. Thus, the new links, indicated by uniform resource locators, may be identified separately from other changes in response to a user inquiry. As still another alternative, any new links may be highlighted in a special way, such as by a distinct color. 
   As still another embodiment of the present invention, in connection with web pages which provide chat or feedback information, any new feedback responses, which have been received since the last time the responses were checked by a user, may be highlighted or otherwise indicated. For example, in connection with stock comment pages, users may provide a running commentary of chat responses or messages on a given topic about a given stock. Instead of requiring the user to remember the user&#39;s last viewed response in the series of responses, a differencing mechanism may be utilized to determine the difference between the information last contained on the page and the information now on the page. Instead of displaying all of the information, the user may be provided with a list of only those new comments received after the user last checked the page. 
   If desired, the software  20  may also automatically or selectively cache each viewed page. This may ensure that a given page is available for subsequent comparison. 
   A portion of the disclosure of this patent document contains material which is subject to copyright protection. The copyright owner has no objection to the facsimile reproduction by any one of the patent disclosure, as it appears in the Patent and Trademark Office patent files or records, but otherwise reserves all copyright rights whatsoever. 
   While the present invention has been described with respect to a limited number of embodiments, those skilled in the art will appreciate numerous modifications and variations therefrom. It is intended that the appended claims cover all such modifications and variations as fall within the true spirit and scope of this present invention.

Technology Category: 3