Virtualbox memo

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hgcmThread, hgcmServiceThread
	HGCM_MSG_CONNECT
	HGCM_MSG_REGEXT
	SVC_MSG_HOSTCALL // when drag and drop occurs
src/VBox/HostServices/DragAndDrop/VBoxDragAndDropSvc.cpp:1071
	DragAndDropService::hostCall
src/VBox/Frontends/VirtualBox/src/main.cpp:939
src/VBox/Main/src-client/ConsoleImpl.cpp
	VMR3Create
src/VBox/HostServices/GuestProperties/VBoxGuestPropSvc.cpp
	Service::call
		GUEST_PROP_FN_GET_PROP
		GUEST_PROP_FN_SET_PROP
		GUEST_PROP_FN_SET_PROP_VALUE
		GUEST_PROP_FN_DEL_PROP
		GUEST_PROP_FN_ENUM_PROPS
		GUEST_PROP_FN_GET_NOTIFICATION