One of the features of an application is that you can store information that is available to all clients that are accessing the application. This information is stored in what is know as an application-scope variable.
To initialize variables in the Application object, you store the information about them in a special ASP file named global.asa. Each application has only one global.asa, placed in the application root.
possible example of global.asa:
<script language="VBScript" runat="Server">
Sub Application_OnStart
Application("myAppVariable") = " "
Application("anotherAppVariable") = 0
End Sub