For all those who have wanted this as a SSI call, I've modified the addon script to be able to be called as a SSI. Grab the script from here: http://www.arlo.net/ubb/cgi-bin/online.txt
Save it to your CGIDIR, set the permissions properly, and rename it to "online.cgi". Then, open it up and edit the configuration variable ssi (set it = 1). Then, just call it from where ever you want.
Donate to UBBDev today to help aid in Operational, Server and Script Maintenance, and Development costs.
Please also see our parent organization VNC Web Services if you're in the need of a new UBB.threads Install or Upgrade, Site/Server Migrations, or Security and Coding Services.