I've used <A HREF="http://www.realvnc.com/" target="_new">RealVnc</A> to do this, If setup correctly at the host, the client computers you are connecting from will not need to have any software installed. I imagine there are other software titles that could do the same but this one is free and works great over a fast connection, not sure on how well it will work on a modem connection.
GK
Yes, I made it past newbie w00t.