To get a specific revision into your workspace, context-click it and choose Get this Revision.
To view a preview of a revision's content, select the Preview tab at the bottom of the Details pane. This shows a preview of any file at any revision. You can resize this tab to view a larger version of the file. If the file is an image, you can view thumbnails of the image by selecting View>Show Files As> and select the thumbnail size that you want to view.To compare two file revisions, click and drag one revision to the other. P4V launches the file diff utility and displays the differences.
To compare two folder revisions, click and drag one revision to the other. P4V launches the folder diff utility.