Hi John,
Yes, the message will not pop up, but CS MessageBox will log the message for you to a file. You can then check the log file sporadically. The default file name is messagebox.log. If you run it as a process though, CS MessageBox will allow you to set a timer as well, on the message window which closes the window automatically. For a WebServer make it very quick, say one second.
Cheers
Rob