ExecutionIdentity
ExecutionIdentity specifies the conceptual role under which an IServicesMgr
should create a proxy. The ExecutionIdentity is intended to be used by
IServicesMgr-derived classes to select an appropriate AuthenticationType for
proxy creation.
CurrentUser = 0
The current user's identity is flowed through the calls.
Manual = 2
Programmatically give the identity for calls.
System = 1
The system's context is used for escalated permissions.