I never cared for RealVNC. I use .NET VNC Viewer. Full of features and free.
http://dotnetvnc.sourceforge.net/- VNC viewer functionalities.
- Full screen mode.
- Client-side scaling.
- Server-side scaling and single window mode.
- Screen rotation.
- Session history.
- Hi-Res support for VGA Pocket PCs and QVGA Smartphones.
- Listen mode.
- etc.