The echo mode attribute indicates whether primitives are echoed, unechoed or drawn normally when passed to a renderer. The method used for echoing and unechoing is identified by the echo method renderer attribute.
If a primitive is designated to be both highlighted and echoed, then it is echoed but not highlighted.
The possible values are PEXNoEcho (the default), PEXEcho, and PEXUnEcho.
The complete list of renderer attributes is listed in the Renderer Attributes Table.
For an overview about Renderers, see General Information. For a list of all Renderer functions and related topics, see Rendering.