This is only used in the context of XCA queries. The value will be set internally from the "home" property of incoming data. For outgoing data, it is easiest to set for all objects in the "passed through" data by using the XdsQueryResponse.SetHomeCommunityID method.
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