External access to embedded web server ?

hi ,

what does enabling external access do ?

Can i share the application link to someone in network when i am working locally?

I tried sharing the following link to users within network but didnt work . whats significance of enabling external access ?

http://localhost:8080/aad/web.do?APPLICATION=XYZ&designersessionid=08963ce4d04e4d2d80e25e3b1f689947