simple example of making a join in a dynamic layer

[DuarteCarreira]

So, according to esri, since 10.1, we can make joins programmaticaly when using dynamic layers:
http://bit.ly/JxdYoG

"Dynamic layers
Dynamic layers allow clients to change layer appearance and behavior on the fly in a map service. Using dynamic layers, you can do the following things:
Define which layers will appear in a map.
Define whether labels will appear for a layer.
Define layer symbology.
Define how layers are rendered (simple, unique value, class breaks).
Define the position and order of layers in the map.
Remove an existing layer from the map.
Add a new layer to the map.
Modify joins to an existing layer/table.
Add joins to an existing layer/table.
Add joins to a new layer/external table."

Can anyone please share a simple example?? No matter what I do can't make this work!!

Thanks.

[DuarteCarreira · Accepted solution]

Some material I found useful:

http://blogs.esri.com/esri/arcgis/tag/dynamic-layers/

and

http://nicogis.blogspot.pt/2013/06/dynamic-layers.html

Now, the best explanation on using dynamic-layers is from a blog post:
http://blogs.esri.com/esri/arcgis/2012/06/01/uploading-client-data-to-perform-thematic-mapping-on-th...

Since esri keeps changing their "perma" links I'm attaching the word doc from that post for future reference.

I find there is little information on how dynamic layers work and how to manage them in all aspects of a web app, like querying, identifying, printing, etc.

More examples are needed...