Yes. It dynamically disables public (or client) caching and switches the page to use server caching. This is because the substitutions need to happen via server-side logic.
It can be implemented in 2 methods:
1. Call the new Response.WriteSubstitution method, passing it a reference to the desired
substitution method callback.
2. Add a control to the page at the desired location, and set its
methodName attribute to the name of the callback method.