Rebound! is a product from Sophisticated Circuits that plugs into the ADB port and automatically restarts the Mac in the event of a crash. And with the Rebound!Assist Plug-in, it can also restart the WebSTAR application without rebooting the machine. You only need this Plug-in if you are using the Rebound! hardware.
When WebSTAR is running, the WebSTAR Rebound! Assist Plug-In sets the User Timer to 5 minutes at one-minute intervals. Once set, the User Timer starts counting down to zero. As long as WebSTAR is running, the Plug-In will continue to reset the User Timer, so it will never reach zero.
If the User Timer ever actually reaches zero, it means that WebSTAR has stopped resetting it, usually due to a crash or freeze. Rebound! will then send an ADB restart command, which forces your system to restart. Assuming you have an alias to the WebSTAR application in your Startup Items folder, the server will automatically launch and start responding to requests.
If you have installed the Plug-In but you do not have the Rebound! hardware, you will see error messages in the Status Window Web Monitor pane. Remove the file from the Plug-Ins folder and restart the server to avoid this error message.