The only way to run two servers on the same machine and listening to the same port, is to have them responding to different virtual hosts. Virtual hosts can either be "physical", where the machine occupies two or more IP addresses and each server is bound to a separate IP address, or "name-based" where only one IP address is used, but the local DNS maps two or more names to the machine and each server is bound to a different name. All of this is quite complicated, and the way most people run multiple servers on one machine is to give them different ports. The default port for HTTP is 80, but many "alternative" webservers, such as Tomcat, come set up to work with another port such as 8080, 8000 or whatever. Are you sure this is not a possibility for your application?
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