When you start loading a web page, Navigator tells CyberViewer that a new page is being loaded. When this happens, a new entry will appear in the history list for the web page. Navigator tends to take its own sweet time in letting other applications know about pages being loaded, so this can take a while. The thumbnail will not be generated yet, so the entry will say "Loading Page..." to let you know that the page has not finished loading yet.
 
When the page has completely loaded, CyberViewer will generate a thumbnail for the entry, and draw the thumbnail in the list.
No Thumbnail
There are times when CyberViewer will not be able to generate a thumbnail. If a web page has not completely loaded, and you click a link in the window to load a new page, then CyberViewer never sees the page as being loaded, so it never has an opportunity to generate a thumbnail. Such entries will say "No Thumbnail" in the thumbnail view. Also, low memory conditions will prevent CyberViewer from being able to create a thumbnail.
No History Entry
Sometimes, an entry for a web page will not be added to the history list. This is usually for one of two reasons. First, if the web page has frames, then entries will not be added when new pages are loaded inside of the frames, since the URL of the main page has not changed. Second, if a page has been visited recently, then it will be stored in Navigator's local cache, and when you visit that page again, rather than reloading it from the web, it will just use the local copy. And since it didn't actually have to load the page, CyberViewer will not be notified that the page was loaded, so it will not be able to add a new entry.
