You can connect to a VNC server from your Leopard system, making it easy to control a remote system. Leopard has this functionality built right in, so you won’t even have to install any other applications to accomplish this.
While in Finder, press the Command key+k on your keyboard. This will bring up the Connect to Server window.
Input vnc://computername or vnc://ipaddress where computername (or ipaddress) is the name (or address) of the VNC server you wish to connect to. If the server is using another port besides the default (5900), add a colon and the port number after the computer name (or address).
Click the Connect button.
Enter your password, when prompted.