This really just comes down to correct configuration of the network between the two machines.
You haven't said what operating system the two machines are running. You should be able to find some tutorials on the internet appropriate for your operating system(s) that you can follow to get your computers connected correctly.
I'm using WinXP on both machines.
By using proxy server software, the client PC can share the internet connection from host PC.
But just can't get it when type http://hostIP:8080/myApp in client PC.
Have i miss up something?