The revision structure contains two types of entries: green, rectangular revisions and cyan, rounded-rectangular branches. To see more revision details at the bottom, select the revision. Same is displayed in a tool tip after a few moments, when hovering over a revision.
You can select revisions by clicking on them. As usual, use the <Ctrl>-key to select multiple revisions.
If one revision is selected, you can bring up an Annotate window for the specified revision.
If one revision is selected, you can compare this revision with the local file (see Compare Window).
If two revisions are selected, you can compare them (see Compare Window).
You also have the ability to save the selected revision in a new file, to open it or to update/check it out with the revision marked sticky.