Static IPs

You need to make the inquiry to your router/server. More than likely, Vista isn't the server and would not be equipped with the commands to do that type of checking.

If you don't know how to check your router/server, speak to your System Administrator.

other than to know which are not in the range that your DHCP server is feeding out.

There are utilities like spycop that will scan a range and tell you what systems are on, but it has no way of knowing which are static or dynamic.