>>>>Hi,
>>>>
>>>>I have a customer where they use several of my ASP.NET applications (it is a large organization with multiple sites). I have always set each ASP.NET application as a separate site. One IT person didn't like it and here is what he did:
>>>>1. He created one site, lets call it 'DmitryApp_Multi_App'
>>>>2. He created a bunch of applications under this site. E.g. "Site1_App", "Site2_app" and so on.
>>>>3. Then when the main page from any of the Sites is to be used (URL) here is way he shows it (and it works):
>>>>
>>>> http://servername.theirorganizationname.org/Site1_app/MainPage.aspx
>>>>
>>>>I can't figure out and hence my question, how and where did he specify the part 'servername.theirorganizationname.org' ?
>>>>
>>>>TIA
>>>
>>>After I read on DNS, I would like to ask to confirm that my understanding is correct (and please correct me if I am wrong).
>>>
>>>Following the example above.
>>>
>>>1. On the customer Web Server I can get to the main page of, say, Site1_app using the following URL:
>>>http://servername/Site1_app/MainPage.aspx
>>>
>>>2. The IT manager showed me that I can get to the same page as:
>>>http://servername.theirorganizationname.org/Site1_app/MainPage.aspx
>>>
>>>Does it mean that he entered in the DNS Manager of their network a "map" (I am sure there is a correct term but I don't know it) that says
>>>"servername.theirorganizationname.org" = "servername" ?
>>
>>'theirorganizationname.org' will be the external DNS which would map to the IP address of the server.
>>'servername' is a sub-domain of that server so the server is responsible for mapping that to another address.
>>
>
>These are the points I don't understand (sorry).
>1. I don't understand the word 'external' in this context

Internet v. Intranet.
.org is a top level domain so the company would need to register 'theirorganization.org' to a fixed IP address. Then anyone entering 'http://theirorganization.org' would end up at the address. If the enter 'http://servername.theirorganization.org' then it's the responsibility of the server at that address to resolve 'servername'. To achieve this the site admin would need to create a sub-domain. How this is done depends on the OS version on the server.

>2. When you are saying 'which would map to the IP address of the server', is this a manual entry by the IT manager? or it is automatically done since this server is on the network of the organization name 'theirorganizationname.org'
>
>The reason I am asking is as follows:
>
>I have another customer where they also use several of my web applications. And I want to emulate this situation so that this 'other' customer would have URLs follows:
>
>http://ServerName.AnotherCustomers.org/Site1_app/MainPage.aspx
>
>I understand the 'ServerName' part of the URL because this is simply the web server name. But where do I enter the 'AnotherCustomer.org'?

As above - you don't do the '****.org' bit - that has to be handled by internet DNS. Also 'ServerName' doesn't have to *be* the server name - it's just a sub-domain name and can be mapped to any IP address.....

Hope that helps - don't think I'm very good at explaining this :-{