ass</CODE>
 or <CODE>
VisCompClass</CODE>
). Note that if this is set, both VTF_IS_WINDOW and VTF_IS_WIN_GROUP must also be set.</DD>
<DT>
VTF_IS_INPUT_NODE</DT><DD>
This flag is an optimization bit. It is set if the object controls input flow (such as a VisContent) or is a target or focus node that is not a window group (VTF_IS_WIN_GROUP). <CODE>
MSG_VIS_VUP_ALTER_INPUT_FLOW</CODE>
 is sent directly to objects with this bit set unless there is a need for them to actually use the VUP mechanism, as is the ca