The DataDrawMask plug-in is used when using viewports (multiple camera windows in Viz render window). The plug-in defines the mask type of the container it controls and the way it is rendered in each of the viewports. The DataField (defined in Field Name) value contains this information.
Note: This plug-in is located in: Plugins -> Container plug-ins -> Data
Information: DataPool plug-ins only work properly on a single channel on the same machine.