1. A method for providing host control of partial trust accessibility comprising the steps of: providing a framework that allows one or more libraries to be identified as partial trust callers enabled to indicate that the one or more libraries could be called from partially trusted code, but not by default; and in response to a particular library of the one or more libraries identified as partial trust callers enabled being loaded in a process, notifying a hosting application so the hosting application can make a determination on whether to revoke partial trust accessibility rights that are granted based on the particular library being identified as partial trust callers enabled.