You can undo the last five content changes made to any design component. Each design component has its own undo stack (i.e., the last five changes you made to it). The changes made to each component are persistent; they survive when you log out and log back into SiteXpress. Keep in mind, however, that there is no corresponding redo function; once you undo a change, there is no way of going forward in the change history for the page.