Is your slimserver running on Mac, Windows or Linux? You'll need to find the IP address of the computer which is running the slimserver software.
Assuming that your computer is running Windows XP, you can find out your IP address by going to the start menu, selecting Run, then typing in cmd. This will start up a command prompt window, which looks just like an old fashioned DOS screen, but in it's own window.
In the command prompt window, type:
ipconfig
It should show something like this:
C:\>ipconfig
Windows IP Configuration
Ethernet adapter Local Area Connection:
Connection-specific DNS Suffix . : somewhere.com
IP Address. . . . . . . . . . . . : 192.168.1.100
Subnet Mask . . . . . . . . . . . : 255.255.254.0
Default Gateway . . . . . . . . . : 192.168.1.1
The line that says "IP Address" will tell you your computer's IP address.
-Rob