AstroView is the program you use to view a shared computer. Once downloaded unstuff or unzip the program and launch it. You will see one screen with buttons "View", "Diconnect", "Options", and "Statistics" along with a line which shows you if you are currently connected or not. Each of the buttons has an equivalent in the menubar. Statistics shows you the amount of used memory, how much data has been sent and read on the current connection and average connection speeds.
Options lets you set some security features and a slow connection option. Disconnect breaks down the current connection. Start brings up another window which allows you to view and control a shared desktop supplying the IP or DNS address, port number, computer name and password. Also available from the "View" menu is the "Sound Settings..." menuitem which allows you to start Voice over IP and pause the display and use of the remote desktop.