If StartSession was not explicitly called then an ApplicationExit event will implicitly call EndSession for easy Gibraltar drop-in support. If StartSession was explicitly called then we expect the client to make a corresponding explicit EndSession call, and the Agent's ApplicationExit handler will not call EndSession.
Requirements
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2