I know that generally speaking, this cant be done, that is get another PC to call a site hosted under the ASP.NET DEvelopment Web Server remotely (generally
Just use a simple Java TCP tunnel. Download this Java app & just tunnel the traffic back. No messing with IIS necessary!
http://jcbserver.uwaterloo.ca/cs436/software/tgui/tcpTunnelGUI.shtml
In command prompt, you'd then run the java app like this... Let's assume you want external access on port 80 and your standard debug environment runs on port 1088...
java -jar tunnel.jar 80 localhost 1088 (Also answered here: Accessing asp. net development server external to VM)