The OnStartPage method is automatically invoked when the Server object is used to create an instance of the SchemaObjects class. When invoked, the Init method is invoked, and the current Internet Information Server instance identifier is passed. This is the instance identifier that can be fetched in an ASP environment using the Request object ServerVariables collection under the key INSTANCE_ID.
Example
<% Set oSchemaObjects = Server.CreateObject(“Membership.SchemaObjects”) %>
‘ in this case, the OnStartPage is called by the scripting context automatically
‘ so one need not invoke Init explicitly.