A video how-to can be seen in a separate post, here.
VMWare Fusion is essentially VMWare Workstation for Mac and so Fusion inherits Workstation’s built-in VNC Server. If you don’t know about VNC, it stands for Virtual Network Computing. You may have seen similar products as Microsofts Remote Desktop Connection or Windows Remote Assist, Citrix GotoMyPC, or many others. VNC is the open-source standard for all of this communication. Apple build a VNC server and client into Mac OS X, to go to a VNC server you just type
vnc:// and the machines address.
To enable the VMWare Fusion VNC server you first have to find the VMX file, to do this open the Fusion VM Manager, right click on the VM you want to enable the server for-then select "Show In Finder". Then in Finder, right-click on the .vmwarevm file and select "Show Package Contents". In the resulting list, find the .vmx file. Right click on this file and open it with a text-editing application (TextEdit or BBEdit is fine). You have to add the following lines to the configuration (it’s always a good idea to copy and paste the .vmx file to the desktop as a backup in the case that you make a mistake.)
**Where you add a port in there, don't use the stock '5900' port, this is highly prone to internet attack, using an individual port allows you to specify in the client which VM to VNC into... for example, Port 5901 could be your XP Pro VM, 5902 could be your Vista VM, 5903 could be your Windows 7 VM, and 5904 could be your Ubuntu VM. If they're all running you could specify the port in your client to connect to a specific one.
And you're done! All you need to do is try it out by openning Safari, typing in vnc://(your_IP_or_host_computer_name_here:the_port_number).
(note the colon ':', you specify the port number after it.)
The next thing to do is to get your VNC accessible from outside your network, but that's another deal entirely. Everything I've said here is how-to enable the server for your local network.
[UPDATE]A great and useful URL is to a VMWare page where you can see other modifications you can make to the configuration file to give you additional functionality is here...http://bit.ly/3BvzjX . [/UPDATE]
[UPDATE 2]You can see a video walk through in another post, here.[/UPDATE 2]