@return <code>true</code> if the operation was successful and <code>false</code> otherwise
@exception SWTException <ul>
<li>ERROR_THREAD_INVALID_ACCESS when called from the wrong thread</li>
<li>ERROR_WIDGET_DISPOSED when the widget has been disposed</li>
</ul>
Navigate to the previous session history item.
@return <code>true</code> if the operation was successful and <code>false</code> otherwise
@exception SWTException <ul> <li>ERROR_THREAD_INVALID_ACCESS when called from the wrong thread</li> <li>ERROR_WIDGET_DISPOSED when the widget has been disposed</li> </ul>
@see #forward
@since 3.0