tightvnc (remote control software)

Virtual Network Computing (VNC) is a remote display system which
allows you to view a desktop environment from anywhere on the Internet
and from a wide variety of machine architectures.
TightVNC is an enhanced VNC distribution. This package contains a
client which will allow you to connect to other desktops running a
VNC or a TightVNC server.

tightvnc home: http://www.tightvnc.com/