Add how to

etc/doxygen/pages/HowTos.dox

@@ -137,4 +137,17 @@ If a complete robot model (including 3d models) is needed, you can pass a filena
 \endcode
 
 This model can be synchronized in the same way as the first model.
+
+
+\section RobotAPI-HowTos-Memory-Plot-Values How to Plot Values from the Memory System
+
+You can use the component \ref Component-MemoryToDebugObserver to query data from memory servers
+and send them to the \ref Component-DebugObserver.
+These values can then be viewed using
+the \ref ArmarXGui-GuiPlugins-ObserverWidget
+or the \ref ArmarXGui-GuiPlugins-PlotterPlugin .
+
+To use this functionality in your own code, use the class
+armarx::armem::client::util::MemoryToDebugObserver.
+
 */