| Platform SDK: Synchronization Manager | 
A user has logged on.
HRESULT Logon( BSTR bstrUserName // User name );
[id(0x00000001)]
SENS calls this method to notify your application that a user has now logged on.
Filtering is not currently supported for this event.
  Windows NT/2000: Requires Windows 2000.
  Windows 95/98: Unsupported.
  Header: Declared in Sensevts.h.
  Library: Use Sensevts.tlb.
ISensLogon::Logoff, About System Event Notification Service, IEventSubscription, IEventSubscription::PutPublisherProperty