Because I am working with Fitnesse and Selenium, I wanted a way to be able to remotely access tests on a central server, right now I am setting up the services on my own machine.  These are the instructions I used to get things in place.

Set-up Fitnesse as a Service:

• Install the Windows Resource Kit if its not already in place
• Run the following command:

          instsrv Fitnesse "C:\Program Files\Windows Resource Kits\Tools\srvany.exe"

• If the resource kit is not in that location update the path, but you MUST use the full path to srvany.exe or it will not work
• Modify the Registry key in HKLM\SYSTEM\CurrentControlSet\Services\Fitnesse
• Change the Image Path to point to Srvany.exe's full path (if not already done so)
• Add a new key - Parameters    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Fitnesse\Parameters
• and three string values,
        AppDirectory - AppDirectory is the root directory of our service where the Fitnesse bat file resides
        Application - is the java.exe executable needed to run our service
        AppParameters - is the parameters used by the java.exe to start our Fitnesse service.
• In the Services panel verify that the Account being used to start the service has the right permissions
• Start the service
• To access the Fitnesse Web UI use the URL - http://local_ip_address:port/

Items to note:

• If the Service starts, but does not open the port make sure Windows Firewall is set to allow access to the port.
• If the Port is open but the open port is not appearing in a netstat -a then use the command line arguments to verify that the command line options work.

Example settings for Fitnesse Service:

AppDirectory - c:\fitnium
Application - C:\Program Files\Java\jre6\bin\java.exe
AppParameters - -cp fitnesse.jar;selenium-java-client-driver fitnesseMain.FitNesseMain -p 8888

Selenium Server:

• In order to assure that Fitnesse can run its tests Selenium needs to be set up the same way
• Modify the Registry key in HKLM\SYSTEM\CurrentControlSet\Services\Selenium
• Change the Image Path to point to Srvany.exe's full path (if not already done so)
• Add a new key - Parameters (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Service\Selenium\Parameters)
• and three string values,
        AppDirectory - AppDirectory is the root directory of our service where the Selenium bat file resides
        Application - is the java.exe executable needed to run our service
        AppParameters - is the parameters used by the java.exe to start our Selenium service.
• In the Services panel verify that the Account being used to start the service has the right permissions
• Start the service 

Example settings for Selenium Service:
AppDirectory - c:\fitnium
Application - C:\Program Files\Java\jre6\bin\java.exe
AppParameters - -jar .\selenium-server-1.0\selenium-server.jar