Each website is an application associated with an application object. You can create subdirectories within the website and use ISM to make them into applications. Then if an application crashes, the website will continue to run.
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The ASP Application Object

When you install Internet Information Server (IIS), the installer creates a default Web site in a directory named wwwroot. You could start building your website in the wwwroot directory, but if you are a Web host provider, you will want to configure multiple websites to rent to different customers. You create websites using the Internet Service Manager (ISM).

Each website will run in its own separate process, so if one website crashes, the other websites will continue to run. Each website is an application associated with an application object. You can create subdirectories within the website (or virtual directories at any location) and use ISM to make them into applications. Then if an application crashes, the website will continue to run.

A website can store data in named memory locations called "variables". Each variable has a "scope" or level from which it is visible and accessible. For example, when a variable is declared within a procedure or function, it is only visible to and can be accessed by only code within that procedure or function. When processing exits the procedure or function, a variable declared within is lost.

Variables can be declared on a webpage outside of any procedure or function. That variable would have a "page" scope and would be visible to and can be accessed by only code within that webpage. Variables can be declared at the application level. Below is an example of how to declare an application level variable.

Application("variable_name") = "some text"

A variable declared at the application level is visible to and can be accessed by all pages within that application. An "Application" object is associated with each application and provides an event that is triggered when the application starts and when the application ends. Active Server Pages (ASP) provides access to these events through a special file named "global.asa". The contents of the global.asa file is shown below.

<script language="VBScript" runat="server">
Sub Application_OnStart

End Sub

Sub Application_OnEnd

End Sub
</script>

The Application_OnStart and Application_OnEnd event handlers can be used for code that needs to run when the first page of the application is served and when the Website is shut down.

Scripts running at the application level can be accessed by all user sessions. The Application object provides two methods we can use to protect shared variables from being written to by more than one user at a time.

Lock restricts other code from writting
Unlock releases the variable for writting

For example, if you wanted to keep a count of the number of pages served by an application, in the global.asa file you could declare an application level variable hits as shown below.

<script language=VBScript runat=server>
Sub Application_OnStart
  Application.Lock
  Application("hits") = 0
  Apllication.Unlock
End Sub
</script>

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